Static tracepoints support
Pedro Alves
pedro@codesourcery.com
Tue Jun 29 21:00:00 GMT 2010
On Monday 28 June 2010 21:04:52, Eli Zaretskii wrote:
> > From: Pedro Alves <pedro@codesourcery.com>
> > > > (gdb) info static-tracepoint-markers
> > > > Enb Address What
> > > > n 0x00007ffff7996692
> > > > String ID: metadata/core_marker_format
> > > > Extra: channel %s name %s format %s
> > >
> > > I'd suggest to have Address before Enb.
> >
> > Any particular reason?
>
> Enb is a minor attribute, it surprised me to see it the first in the
> line.
Hmm, how about I add a column with a counter, for ease of reading. This
can't be expected to be stable, but should help readabily --- for example,
dynamically loaded or unloaded shared libraries can change the number of
markers in the program. Let me give it a try ... [done].
> > This is the same order of "info breakpoints" output.
>
> Ah, but "info breakpoints" starts with a number, which is a kind of ID
> of the breakpoint. There's nothing like that here, but the address
> can serve as replacement. Not a major issue, obviously.
>
> > It leaves Address and What alongside, wich IMO is better as they're ralated.
>
> We could put Enb last.
Doesn't really work nicely, because a column like the What column works
better without a specific alignment, so that it behaves like it had
no fixed width, so it works best last. I wish gdb's column support was
smart enough to be able to auto wrap columns nicely, à la org-mode, vis:
| Num | Name | What | Other column |
|-----+--------------+----------+--------------|
| 1 | foo bar | foo | another |
| | | bar what | broken |
| | | | sentence |
|-----+--------------+----------+--------------|
| 2 | the other | what? | yummy |
but, AFAIK, it isn't.
I've spent a while trying to get something that look better,
and here's the current status:
(gdb) info static-tracepoint-markers
Cnt ID Enb Address What
1 metadata/core_marker_format n 0x00007fc3d7466692
Data: "channel %s name %s format %s"
2 metadata/core_marker_format n 0x00007fc3d7467897
Data: "channel %s name %s format %s"
3 metadata/core_marker_id n 0x00007fc3d746857d
Data: "channel %s name %s event_id %hu int #1u%zu long #1u%zu pointer #1u%zu size_t #1u%zu alignment #1u%u"
4 metadata/core_marker_id n 0x00007fc3d7468a04
Data: "channel %s name %s event_id %hu int #1u%zu long #1u%zu pointer #1u%zu size_t #1u%zu alignment #1u%u"
5 metadata/core_marker_id n 0x00007fc3d746a006
Data: "channel %s name %s event_id %hu int #1u%zu long #1u%zu pointer #1u%zu size_t #1u%zu alignment #1u%u"
6 metadata/core_marker_format n 0x00007fc3d746a235
Data: "channel %s name %s format %s"
7 ust/potential_exec n 0x00007fc3d7487240
Data: " "
8 ust/bar2 y 0x0000000000400c98 in main at stexample.c:40
Data: "number1 %d number2 %d"
Probed by static tracepoints: #2
9 ust/bar2 n 0x0000000000400df9 in main at stexample.c:41
Data: "number1 %d number2 %d"
10 ust/bar33 n 0x0000000000400fe0 in main at stexample.c:39
Data: "str %s"
11 ust/dummymark n 0x00000000004011a8
Data: " "
I gave up and added a column for the "ID". Very large IDs will
misalign the table; it's a compromise.
> > If you have no debug info for the locations, the "What" field is empty,
> > just like with "info breakpoints":
>
> Well, maybe it's worth mentioning.
You're right. I hadn't actually documented the columns and the
output of that command thoroughly. Done so now.
> > Multiple breakpoints at one place are permitted, and useful if conditional.
> >
> > I don't think it is incomplete; it sounds correct to me. A breakpoint can
> > be conditional or unconditional, so I read that as: it's useful to have more
> > than one breakpoint at the same place when they are conditional breakpoints.
>
> But only if the conditionals are different.
>
> Anyway, it confused me, so perhaps it's a good idea to clarify.
Okay, I agree, though I'd prefer to do that as a follow up, where I
change both the break- and tracepoint command's help output at once.
Is that okay with you? (I'm collecting a list of small generic
FIXME's unrelated to static tracepoints I'll address afterwards).
> > > > This usually consists of data formatted to a
> > > > +character string using the format provided by the programmer that
> > > > +instrumented the program. E.g., on some systems, an instrumentation
> > > > +point resembles a printf function call:
> > > > +
> > > > +@smallexample
> > > > + TRACE(tp1, "hello %s", master_name)
> > > > +@end smallexample
> > >
> > > How do you mean ``on some systems''? This support is inherently
> > > platform-specific, and is extremely unlikely to be extended to
> > > any platform but GNU/Linux. It doesn't seem a good idea to be vague
> > > about this issue here.
> >
> > This was trying to not be platform specific on purpose. The support in
> > GDB is not platform specific in any way. The gdbserver
> > implementation only works on linux GNU/Linux presently, but it could
> > be made to work on other platforms. UST runs entirely in userspace,
> > so it could be made to work on other systems as well.
>
> Maybe we should just say "on GNU/Linux", then.
I've rewritten and extended this part. Let me know if it looks better now.
> Yes. A few more nits:
>
> > +Markers}. For example, in the following small program using the UST
> > +tracing engine:
> > +
> > +@smallexample
> > +main ()
> > +@{
> > + trace_mark(ust, bar33, "str %s", "FOOBAZ");
> > +@}
> > +@end smallexample
> > +
> > +The marker id is composed of joining the first two arguments to the
>
> I think you meant to begin with lower-case "the marker id", and you
> also want @noindent before it.
Thanks, yes exactly.
>
> > +@samp{hello $yourname}. When analying the trace buffer, you can
> ^^^^^^^^
> A typo.
Fixed.
>
> > +@item E @var{nn}
> > +An error occurred. @var{nn} are hex digits.
>
> But in the code, I see error strings that use text, not hex digits.
> For example:
>
> > + sprintf (packet, "E.no marker found at 0x%s", paddress (address));
Gotcha. This is a known user manual "bug". Most (all?) packets
only document E @var{nn} as error return, but that extended format
is also allowed:
remote.c:packet_check_result()
{
...
/* The stub recognized the packet request. Check that the
operation succeeded. */
if (buf[0] == 'E'
&& isxdigit (buf[1]) && isxdigit (buf[2])
&& buf[3] == '\0')
/* "Enn" - definitly an error. */
return PACKET_ERROR;
/* Always treat "E." as an error. This will be used for
more verbose error messages, such as E.memtypes. */
if (buf[0] == 'E' && buf[1] == '.')
return PACKET_ERROR;
I think we have a local patch in our (CS) tree cleaning up this
particular issue in the manual across all packets. I'll
dig for it.
On Monday 28 June 2010 21:05:50, Eli Zaretskii wrote:
> > > I would suggest to reverse the order of the steps: first to query the
> > > target about the marker with the old string ID, and only if it is not
> > > found, use the heuristics in step 1. The rationale is that if the
> > > target can provide the info, it is always more reliable than any
> > > heuristics.
>
> You didn't respond to this part. I'm curious to hear your opinion on
> why it is TRT the way you coded it.
Whooops, sorry, I meant to come back to this, then I completely forgot
about it. Thanks for bringing it up.
That particular heuristic only comes into play for tracepoints set
by address or line number. (I expect by line number to be used
often by users using frontends.) For those, I left this order in
place for two reasons: 1st, it catches the case of the user renaming
the markers names in the code, while leaving the code mostly
unchanged. 2nd, the UST library actually allows having more than
one marker with the same ID, although it is discouraged in the
documentation precisely because it confuses tools. So
if we query the target for the string ID first, we may face
the situation where we won't know which of the markers with
the same name corresponds to the static tracepoint we're trying
to match. So querying the target is heuristic too. If the
static tracepoint had been set by marker id, then we don't need to
consider the multi-markers-same-id issue, or renaming issues --- the
user is for sure interested in all markers of that name. This latter
case is handled elsewhere (breakpoint_re_set). In other words, we
give priority to the marker id already. I actually wasn't handling
this case (multiple markers, same name) the best I thought we
can in the previous patch. This new version improves on that,
and adds more comments explaing why things are
done that way. Of course, none of this is cast to stone; I
think experience will let us know if we should tweak the
heuristics.
Here's a new version of the patch integrating all of the
above. Any further comments?
Thanks for all your help so far.
--
Pedro Alves
2010-06-29 Pedro Alves <pedro@codesourcery.com>
gdb/gdbserver/
* configure.ac: Handle --with-ust. substitute ustlibs and ustinc.
* mem-break.c (uninsert_all_breakpoints)
(reinsert_all_breakpoints): New.
* mem-break.h (reinsert_all_breakpoints, uninsert_all_breakpoints):
* tracepoint.c (ust_loaded, helper_thread_id, cmd_buf): New.
(gdb_agent_ust_loaded, helper_thread_id)
(gdb_agent_helper_thread_id): New macros.
(struct ipa_sym_addresses): Add addr_ust_loaded,
addr_helper_thread_id, addr_cmd_buf.
(symbol_list): Add ust_loaded, helper_thread_id, cmd_buf.
(in_process_agent_loaded_ust): New.
(write_e_ust_not_loaded): New.
(maybe_write_ipa_ust_not_loaded): New.
(struct collect_static_trace_data_action): New.
(enum tracepoint_type) <static_tracepoint>: New.
(struct tracepoint) <handle>: Mention static tracepoints.
(struct static_tracepoint_ctx): New.
(CMD_BUF_SIZE): New.
(add_tracepoint_action): Handle static tracepoint actions.
(unprobe_marker_at): New.
(clear_installed_tracepoints): Handle static tracepoints.
(cmd_qtdp): Handle static tracepoints.
(probe_marker_at): New.
(cmd_qtstart): Handle static tracepoints.
(response_tracepoint): Handle static tracepoints.
(cmd_qtfstm, cmd_qtsstm, cmd_qtstmat): New.
(handle_tracepoint_query): Handle qTfSTM, qTsSTM and qTSTMat.
(get_context_regcache): Handle static tracepoints.
(do_action_at_tracepoint): Handle static tracepoint actions.
(traceframe_find_block_type): Handle static trace data blocks.
(traceframe_read_sdata): New.
(download_tracepoints): Download static tracepoint actions.
[HAVE_UST] Include ust/ust.h, dlfcn.h, sys/socket.h, and sys/un.h.
(GDB_PROBE_NAME): New.
(ust_ops): New.
(GET_UST_SYM): New.
(USTF): New.
(dlsym_ust): New.
(ust_marker_to_static_tracepoint): New.
(gdb_probe): New.
(collect_ust_data_at_tracepoint): New.
(gdb_ust_probe): New.
(UNIX_PATH_MAX, SOCK_DIR): New.
(gdb_ust_connect_sync_socket): New.
(resume_thread, stop_thread): New.
(run_inferior_command): New.
(init_named_socket): New.
(gdb_ust_socket_init): New.
(cstr_to_hexstr): New.
(next_st): New.
(first_marker, next_marker): New.
(response_ust_marker): New.
(cmd_qtfstm, cmd_qtsstm): New.
(unprobe_marker_at, probe_marker_at): New.
(cmd_qtstmat, gdb_ust_thread): New.
(gdb_ust_init): New.
(initialize_tracepoint_ftlib): Call gdb_ust_init.
* linux-amd64-ipa.c [HAVE_UST]: Include ust/processor.h
(ST_REGENTRY): New.
(x86_64_st_collect_regmap): New.
(X86_64_NUM_ST_COLLECT_GREGS): New.
(AMD64_RIP_REGNUM): New.
(supply_static_tracepoint_registers): New.
* linux-i386-ipa.c [HAVE_UST]: Include ust/processor.h
(ST_REGENTRY): New.
(i386_st_collect_regmap): New.
(i386_NUM_ST_COLLECT_GREGS): New.
(supply_static_tracepoint_registers): New.
* server.c (handle_query): Handle qXfer:statictrace:read.
<qSupported>: Report support for StaticTracepoints, and
qXfer:statictrace:read features.
* server.h (traceframe_read_sdata)
(supply_static_tracepoint_registers): Declare.
* remote-utils.c (convert_int_to_ascii, hexchars, ishex, tohex)
(unpack_varlen_hex): Include in IPA build.
* Makefile.in (IPA_OBJS): Add remote-utils-ipa.o.
* config.in, configure: Regenerate.
gdb/
* NEWS: Mention new support for static tracepoints.
(New packets): Mention qTfSTM, qTsSTM, qTSTMat and
qXfer:statictrace:read.
(New features in the GDB remote stub, GDBserver): Mention static
tracepoints support using an UST based backend.
(New commands): Mention "info static-tracepoint-markers" and
"strace".
* breakpoint.c (is_marker_spec): New.
(is_tracepoint): Handle static tracepoints.
(validate_commands_for_breakpoint): Static tracepoints can't do
while-stepping.
(static_tracepoints_here): New.
(bpstat_what): Handle static tracepoints.
(print_one_breakpoint_location, allocate_bp_location, mention):
Ditto.
(create_breakpoint_sal): Ditto.
(decode_static_tracepoint_spec): New.
(create_breakpoint): Replace `hardwareflag', and `traceflag' with
`type_wanted'. Adjust. Handle static tracepoint marker
locations.
(break_command_1): Adjust.
(update_static_tracepoint): New.
(update_breakpoint_locations): Handle static tracepoints.
(breakpoint_re_set_one): Handle static tracepoint marker
locations.
(disable_command, enable_command): Handle static tracepoints.
(trace_command, ftrace_command): Adjust.
(strace_command): New.
(create_tracepoint_from_upload): Adjust.
(save_breakpoints): Handle static tracepoints.
(_initialize_breakpoint): Install the "strace" command.
* breakpoint.h (enum bptype): New bp_static_tracepoint type.
(struct breakpoint): New fields static_trace_marker_id and
static_trace_marker_id_idx.
(breakpoints_here_p): Declare.
(create_breakpoint): Adjust.
(static_tracepoints_here): Declare.
* remote.c (struct remote_state) <static_tracepoints>: New field.
(PACKET_qXfer_statictrace_read, PACKET_StaticTracepoints): New.
(remote_static_tracepoint_marker_at): New.
(remote_static_tracepoint_markers_by_strid): New.
(remote_static_tracepoint_feature): New.
(remote_disconnected_tracing_feature): Handle "StaticTracepoints".
(remote_xfer_partial): Handle TARGET_OBJECT_STATIC_TRACE_DATA.
(remote_supports_static_tracepoints): New.
(remote_download_tracepoint): Download static tracepoints.
(init_remote_ops): Install remote_static_tracepoint_marker_at and
remote_static_tracepoint_markers_by_strid.
(_initialize_remote): Install set|show remote static-tracepoints,
and set|show remote read-sdata-object commands.
* target.c (update_current_target): Inherit and default
to_static_tracepoint_marker_at, and
to_static_tracepoint_markers_by_strid.
* target.h (static_tracepoint_marker): Forward declare.
(enum target_object): New object TARGET_OBJECT_STATIC_TRACE_DATA.
(static_tracepoint_marker_p): New typedef.
(DEF_VEC_P(static_tracepoint_marker_p)): New VEC type.
(struct target_ops): New fields to_static_tracepoint_marker_at and
to_static_tracepoint_markers_by_strid.
(target_static_tracepoint_marker_at)
(target_static_tracepoint_markers_by_strid): New.
* tracepoint.c: Include source.h.
(validate_actionline): Handle $_sdata.
(struct collection_list): New field strace_data.
(add_static_trace_data): New.
(clear_collection_list): Clear strace_data.
(stringify_collection_list): Account for a possible static trace
data collection.
(encode_actions_1): Encode an $_sdata collection.
(parse_tracepoint_definition): Handle static tracepoints.
(parse_static_tracepoint_marker_definition): New.
(release_static_tracepoint_marker): New.
(print_one_static_tracepoint_marker): New.
(info_static_tracepoint_markers_command): New.
(sdata_make_value): New.
(_initialize_tracepoint): Create the $_sdata convenience variable.
Add the "info static-tracepoint-markers" command.
Mention $_sdata in the "collect" command's help output.
* tracepoint.h (struct static_tracepoint_marker): New.
(parse_static_tracepoint_marker_definition)
(release_static_tracepoint_marker): Declare.
* mi/mi-cmd-break.c (mi_cmd_break_insert): Adjust.
* python/py-breakpoint.c (bppy_new): Adjust.
doc/
* gdb.texinfo (Convenience Variables): Document $_sdata.
(Commands to Set Tracepoints): Describe static tracepoints. Add
`Listing Static Tracepoint Markers' menu entry. Document
"strace".
(Tracepoint Action Lists): Document collecting $_sdata.
(Listing Static Tracepoint Markers): New subsection.
(Tracepoints support in gdbserver): Mention static tracepoints.
(remote packets, enabling and disabling): Mention
read-sdata-object.
(General Query Packets) <qSupported>: Document qXfer:sdata:read
and StaticTracepoint.
Mention qTfSTM, qTsSTM and qTSTMat as tracepoint packets.
Document qXfer:sdata:read.
(Tracepoint packets): Document qTfSTM, qTsSTM and qTSTMat.
---
gdb/NEWS | 69 +-
gdb/breakpoint.c | 450 +++++++++++++-
gdb/breakpoint.h | 20
gdb/doc/gdb.texinfo | 266 +++++++-
gdb/gdbserver/Makefile.in | 12
gdb/gdbserver/config.in | 3
gdb/gdbserver/configure | 104 +++
gdb/gdbserver/configure.ac | 48 +
gdb/gdbserver/linux-amd64-ipa.c | 89 ++
gdb/gdbserver/linux-i386-ipa.c | 77 ++
gdb/gdbserver/mem-break.c | 22
gdb/gdbserver/mem-break.h | 11
gdb/gdbserver/remote-utils.c | 19
gdb/gdbserver/server.c | 48 +
gdb/gdbserver/server.h | 7
gdb/gdbserver/tracepoint.c | 1274 +++++++++++++++++++++++++++++++++++++++-
gdb/mi/mi-cmd-break.c | 15
gdb/python/py-breakpoint.c | 2
gdb/remote.c | 156 ++++
gdb/target.c | 8
gdb/target.h | 22
gdb/tracepoint.c | 303 +++++++++
gdb/tracepoint.h | 19
23 files changed, 2967 insertions(+), 77 deletions(-)
Index: src/gdb/gdbserver/configure.ac
===================================================================
--- src.orig/gdb/gdbserver/configure.ac 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/configure.ac 2010-06-29 21:42:05.000000000 +0100
@@ -45,6 +45,54 @@ AC_CHECK_HEADERS(sgtty.h termio.h termio
AC_CHECK_FUNCS(pread pwrite pread64)
AC_REPLACE_FUNCS(memmem)
+# Check for UST
+ustlibs=""
+ustinc=""
+
+AC_ARG_WITH(ust, [ --with-ust=PATH Specify prefix directory for the installed UST package
+ Equivalent to --with-ust-include=PATH/include
+ plus --with-ust-lib=PATH/lib])
+AC_ARG_WITH(ust_include, [ --with-ust-include=PATH Specify directory for installed UST include files])
+AC_ARG_WITH(ust_lib, [ --with-ust-lib=PATH Specify the directory for the installed UST library])
+
+case $with_ust in
+ no)
+ ustlibs=
+ ustinc=
+ ;;
+ "" | yes)
+ ustlibs=" -lust "
+ ustinc=""
+ ;;
+ *)
+ ustlibs="-L$with_ust/lib -lust"
+ ustinc="-I$with_ust/include "
+ ;;
+esac
+if test "x$with_ust_include" != x; then
+ ustinc="-I$with_ust_include "
+fi
+if test "x$with_ust_lib" != x; then
+ ustlibs="-L$with_ust_lib -lust"
+fi
+
+if test "x$with_ust" != "xno"; then
+ saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $ustinc"
+ AC_MSG_CHECKING([for ust])
+ AC_TRY_COMPILE([
+#define CONFIG_UST_GDB_INTEGRATION
+#include <ust/ust.h>
+ ],[],
+ [AC_MSG_RESULT([yes]); AC_DEFINE(HAVE_UST, 1, [Define if UST is available])],
+ [AC_MSG_RESULT([no]); ustlibs= ; ustinc= ])
+ CFLAGS="$saved_CFLAGS"
+fi
+
+# Flags needed for UST
+AC_SUBST(ustlibs)
+AC_SUBST(ustinc)
+
dnl dladdr is glibc-specific. It is used by thread-db.c but only for
dnl debugging messages. It lives in -ldl which is handled below so we don't
dnl use AC_CHECK_LIB (or AC_SEARCH_LIBS) here. Instead we just temporarily
Index: src/gdb/gdbserver/mem-break.c
===================================================================
--- src.orig/gdb/gdbserver/mem-break.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/mem-break.c 2010-06-29 21:42:05.000000000 +0100
@@ -777,6 +777,17 @@ uninsert_breakpoints_at (CORE_ADDR pc)
uninsert_raw_breakpoint (bp);
}
+void
+uninsert_all_breakpoints (void)
+{
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if (bp->inserted)
+ uninsert_raw_breakpoint (bp);
+}
+
static void
reinsert_raw_breakpoint (struct raw_breakpoint *bp)
{
@@ -817,6 +828,17 @@ reinsert_breakpoints_at (CORE_ADDR pc)
}
void
+reinsert_all_breakpoints (void)
+{
+ struct process_info *proc = current_process ();
+ struct raw_breakpoint *bp;
+
+ for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next)
+ if (!bp->inserted)
+ reinsert_raw_breakpoint (bp);
+}
+
+void
check_breakpoints (CORE_ADDR stop_pc)
{
struct process_info *proc = current_process ();
Index: src/gdb/gdbserver/mem-break.h
===================================================================
--- src.orig/gdb/gdbserver/mem-break.h 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/mem-break.h 2010-06-29 21:42:05.000000000 +0100
@@ -78,6 +78,17 @@ void reinsert_breakpoints_at (CORE_ADDR
void uninsert_breakpoints_at (CORE_ADDR where);
+/* Reinsert all breakpoints of the current process (and change their
+ status to inserted). */
+
+void reinsert_all_breakpoints (void);
+
+/* Uninsert all breakpoints of the current process (and change their
+ status to uninserted). This still leaves the breakpoints in the
+ table. */
+
+void uninsert_all_breakpoints (void);
+
/* See if any breakpoint claims ownership of STOP_PC. Call the handler for
the breakpoint, if found. */
Index: src/gdb/gdbserver/tracepoint.c
===================================================================
--- src.orig/gdb/gdbserver/tracepoint.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/tracepoint.c 2010-06-29 21:42:05.000000000 +0100
@@ -135,6 +135,9 @@ trace_vdebug (const char *fmt, ...)
# define get_raw_reg gdb_agent_get_raw_reg
# define get_trace_state_variable_value gdb_agent_get_trace_state_variable_value
# define set_trace_state_variable_value gdb_agent_set_trace_state_variable_value
+# define ust_loaded gdb_agent_ust_loaded
+# define helper_thread_id gdb_agent_helper_thread_id
+# define cmd_buf gdb_agent_cmd_buf
#endif
#ifndef IN_PROCESS_AGENT
@@ -168,6 +171,9 @@ struct ipa_sym_addresses
CORE_ADDR addr_get_raw_reg;
CORE_ADDR addr_get_trace_state_variable_value;
CORE_ADDR addr_set_trace_state_variable_value;
+ CORE_ADDR addr_ust_loaded;
+ CORE_ADDR addr_helper_thread_id;
+ CORE_ADDR addr_cmd_buf;
};
#define STRINGIZE_1(STR) #STR
@@ -209,6 +215,9 @@ static struct
IPA_SYM(get_raw_reg),
IPA_SYM(get_trace_state_variable_value),
IPA_SYM(set_trace_state_variable_value),
+ IPA_SYM(ust_loaded),
+ IPA_SYM(helper_thread_id),
+ IPA_SYM(cmd_buf),
};
struct ipa_sym_addresses ipa_sym_addrs;
@@ -223,14 +232,55 @@ in_process_agent_loaded (void)
static int read_inferior_integer (CORE_ADDR symaddr, int *val);
+/* Returns true if both the in-process agent library and the static
+ tracepoints libraries are loaded in the inferior. */
+
+static int
+in_process_agent_loaded_ust (void)
+{
+ int loaded = 0;
+
+ if (!in_process_agent_loaded ())
+ {
+ warning ("In-process agent not loaded");
+ return 0;
+ }
+
+ if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded))
+ {
+ warning ("Error reading ust_loaded in lib");
+ return 0;
+ }
+
+ return loaded;
+}
+
static void
write_e_ipa_not_loaded (char *buffer)
{
sprintf (buffer,
"E.In-process agent library not loaded in process. "
- "Dynamic tracepoints unavailable.");
+ "Fast and static tracepoints unavailable.");
+}
+
+/* Write an error to BUFFER indicating that UST isn't loaded in the
+ inferior. */
+
+static void
+write_e_ust_not_loaded (char *buffer)
+{
+#ifdef HAVE_UST
+ sprintf (buffer,
+ "E.UST library not loaded in process. "
+ "Static tracepoints unavailable.");
+#else
+ sprintf (buffer, "E.GDBserver was built without static tracepoints support");
+#endif
}
+/* If the in-process agent library isn't loaded in the inferior, write
+ an error to BUFFER, and return 1. Otherwise, return 0. */
+
static int
maybe_write_ipa_not_loaded (char *buffer)
{
@@ -242,6 +292,26 @@ maybe_write_ipa_not_loaded (char *buffer
return 0;
}
+/* If the in-process agent library and the ust (static tracepoints)
+ library aren't loaded in the inferior, write an error to BUFFER,
+ and return 1. Otherwise, return 0. */
+
+static int
+maybe_write_ipa_ust_not_loaded (char *buffer)
+{
+ if (!in_process_agent_loaded ())
+ {
+ write_e_ipa_not_loaded (buffer);
+ return 1;
+ }
+ else if (!in_process_agent_loaded_ust ())
+ {
+ write_e_ust_not_loaded (buffer);
+ return 1;
+ }
+ return 0;
+}
+
/* Cache all future symbols that the tracepoints module might request.
We can not request symbols at arbitrary states in the remote
protocol, only when the client tells us that new symbols are
@@ -347,6 +417,8 @@ static void download_tracepoints (void);
static void download_trace_state_variables (void);
static void upload_fast_traceframes (void);
+static int run_inferior_command (char *cmd);
+
static int
read_inferior_integer (CORE_ADDR symaddr, int *val)
{
@@ -542,6 +614,12 @@ struct eval_expr_action
struct agent_expr *expr;
};
+/* An 'L' (collect static trace data) action. */
+struct collect_static_trace_data_action
+{
+ struct tracepoint_action base;
+};
+
/* This structure describes a piece of the source-level definition of
the tracepoint. The contents are not interpreted by the target,
but preserved verbatim for uploading upon reconnection. */
@@ -569,6 +647,10 @@ enum tracepoint_type
/* A fast tracepoint implemented with a jump instead of a trap. */
fast_tracepoint,
+
+ /* A static tracepoint, implemented by a program call into a tracing
+ library. */
+ static_tracepoint
};
struct tracepoint_hit_ctx;
@@ -667,8 +749,8 @@ struct tracepoint
char **step_actions_str;
/* Handle returned by the breakpoint or tracepoint module when we
- inserted the trap or jump. NULL if we haven't inserted it
- yet. */
+ inserted the trap or jump, or hooked into a static tracepoint.
+ NULL if we haven't inserted it yet. */
void *handle;
#endif
@@ -1157,6 +1239,35 @@ struct fast_tracepoint_ctx
struct tracepoint *tpoint;
};
+/* Static tracepoint specific data to be passed down to
+ collect_data_at_tracepoint. */
+struct static_tracepoint_ctx
+{
+ struct tracepoint_hit_ctx base;
+
+ /* The regcache corresponding to the registers state at the time of
+ the tracepoint hit. Initialized lazily, from REGS. */
+ struct regcache regcache;
+ int regcache_initted;
+
+ /* The buffer space REGCACHE above uses. We use a separate buffer
+ instead of letting the regcache malloc for both signal safety and
+ performance reasons; this is allocated on the stack instead. */
+ unsigned char *regspace;
+
+ /* The register buffer as passed on by lttng/ust. */
+ struct registers *regs;
+
+ /* The "printf" formatter and the args the user passed to the marker
+ call. We use this to be able to collect "static trace data"
+ ($_sdata). */
+ const char *fmt;
+ va_list *args;
+
+ /* The GDB tracepoint matching the probed marker that was "hit". */
+ struct tracepoint *tpoint;
+};
+
#else
/* Static tracepoint specific data to be passed down to
@@ -1228,6 +1339,10 @@ static struct tracepoint *fast_tracepoin
#define cmpxchg(mem, oldval, newval) \
__sync_val_compare_and_swap (mem, oldval, newval)
+/* The size in bytes of the buffer used to talk to the IPA helper
+ thread. */
+#define CMD_BUF_SIZE 1024
+
/* Record that an error occurred during expression evaluation. */
static void
@@ -1756,6 +1871,18 @@ add_tracepoint_action (struct tracepoint
++act;
break;
}
+ case 'L':
+ {
+ struct collect_static_trace_data_action *raction;
+
+ raction = xmalloc (sizeof *raction);
+ raction->base.type = *act;
+ action = &raction->base;
+
+ trace_debug ("Want to collect static trace data");
+ ++act;
+ break;
+ }
case 'S':
trace_debug ("Unexpected step action, ignoring");
++act;
@@ -2147,6 +2274,17 @@ cmd_qtinit (char *packet)
write_ok (packet);
}
+/* Unprobe the UST marker at ADDRESS. */
+
+static void
+unprobe_marker_at (CORE_ADDR address)
+{
+ char cmd[CMD_BUF_SIZE];
+
+ sprintf (cmd, "unprobe_marker_at:%s", paddress (address));
+ run_inferior_command (cmd);
+}
+
/* Restore the program to its pre-tracing state. This routine may be called
in error situations, so it needs to be careful about only restoring
from known-valid bits. */
@@ -2186,6 +2324,19 @@ clear_installed_tracepoints (void)
case fast_tracepoint:
delete_fast_tracepoint_jump (tpoint->handle);
break;
+ case static_tracepoint:
+ if (prev_stpoint != NULL
+ && prev_stpoint->address == tpoint->address)
+ /* Nothing to do. We already unprobed a tracepoint set at
+ this marker address (and there can only be one probe
+ per marker). */
+ ;
+ else
+ {
+ unprobe_marker_at (tpoint->address);
+ prev_stpoint = tpoint;
+ }
+ break;
}
tpoint->handle = NULL;
@@ -2258,6 +2409,11 @@ cmd_qtdp (char *own_buf)
packet = unpack_varlen_hex (packet, &count);
tpoint->orig_size = count;
}
+ else if (*packet == 'S')
+ {
+ tpoint->type = static_tracepoint;
+ ++packet;
+ }
else if (*packet == 'X')
{
actparm = (char *) packet;
@@ -2570,12 +2726,39 @@ sort_tracepoints (void)
}
}
+/* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
+ the command fails, or 0 otherwise. If the command ran
+ successfully, but probing the marker failed, ERROUT will be filled
+ with the error to reply to GDB, and -1 is also returned. This
+ allows directly passing IPA errors to GDB. */
+
+static int
+probe_marker_at (CORE_ADDR address, char *errout)
+{
+ char cmd[CMD_BUF_SIZE];
+ int err;
+
+ sprintf (cmd, "probe_marker_at:%s", paddress (address));
+ err = run_inferior_command (cmd);
+
+ if (err == 0)
+ {
+ if (*cmd == 'E')
+ {
+ strcpy (errout, cmd);
+ return -1;
+ }
+ }
+
+ return err;
+}
+
#define MAX_JUMP_SIZE 20
static void
cmd_qtstart (char *packet)
{
- struct tracepoint *tpoint, *prev_ftpoint;
+ struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint;
int slow_tracepoint_count, fast_count;
CORE_ADDR jump_entry;
@@ -2614,6 +2797,9 @@ cmd_qtstart (char *packet)
/* No previous fast tpoint yet. */
prev_ftpoint = NULL;
+ /* No previous static tpoint yet. */
+ prev_stpoint = NULL;
+
*packet = '\0';
/* Install tracepoints. */
@@ -2699,6 +2885,32 @@ cmd_qtstart (char *packet)
}
}
}
+ else if (tpoint->type == static_tracepoint)
+ {
+ if (maybe_write_ipa_ust_not_loaded (packet))
+ {
+ trace_debug ("Requested a static tracepoint, but static "
+ "tracepoints are not supported.");
+ break;
+ }
+
+ /* Can only probe a given marker once. */
+ if (prev_stpoint != NULL && prev_stpoint->address == tpoint->address)
+ {
+ tpoint->handle = (void *) -1;
+ }
+ else
+ {
+ if (probe_marker_at (tpoint->address, packet) == 0)
+ {
+ tpoint->handle = (void *) -1;
+
+ /* So that we can handle multiple static tracepoints
+ at the same address easily. */
+ prev_stpoint = tpoint;
+ }
+ }
+ }
/* Any failure in the inner loop is sufficient cause to give
up. */
@@ -3039,6 +3251,8 @@ response_tracepoint (char *packet, struc
tpoint->pass_count);
if (tpoint->type == fast_tracepoint)
sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size);
+ else if (tpoint->type == static_tracepoint)
+ sprintf (packet + strlen (packet), ":S");
if (tpoint->cond)
{
@@ -3213,6 +3427,36 @@ cmd_qtsv (char *packet)
strcpy (packet, "l");
}
+/* Return the first static tracepoint marker, and initialize the state
+ machine that will iterate through all the static tracepoints
+ markers. */
+
+static void
+cmd_qtfstm (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet);
+}
+
+/* Return additional static tracepoints markers. */
+
+static void
+cmd_qtsstm (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet);
+}
+
+/* Return the definition of the static tracepoint at a given address.
+ Result packet is the same as qTsST's. */
+
+static void
+cmd_qtstmat (char *packet)
+{
+ if (!maybe_write_ipa_ust_not_loaded (packet))
+ run_inferior_command (packet);
+}
+
/* Respond to qTBuffer packet with a block of raw data from the trace
buffer. GDB may ask for a lot, but we are allowed to reply with
only as much as will fit within packet limits or whatever. */
@@ -3384,6 +3628,21 @@ handle_tracepoint_query (char *packet)
cmd_qtbuffer (packet);
return 1;
}
+ else if (strcmp ("qTfSTM", packet) == 0)
+ {
+ cmd_qtfstm (packet);
+ return 1;
+ }
+ else if (strcmp ("qTsSTM", packet) == 0)
+ {
+ cmd_qtsstm (packet);
+ return 1;
+ }
+ else if (strncmp ("qTSTMat:", packet, strlen ("qTSTMat:")) == 0)
+ {
+ cmd_qtstmat (packet);
+ return 1;
+ }
return 0;
}
@@ -3697,6 +3956,14 @@ tracepoint_was_hit (struct thread_info *
#endif
+#if defined IN_PROCESS_AGENT && defined HAVE_UST
+struct ust_marker_data;
+static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
+ CORE_ADDR stop_pc,
+ struct tracepoint *tpoint,
+ struct traceframe *tframe);
+#endif
+
/* Create a trace frame for the hit of the given tracepoint in the
given thread. */
@@ -3803,6 +4070,25 @@ get_context_regcache (struct tracepoint_
}
regcache = &fctx->regcache;
}
+#ifdef HAVE_UST
+ if (ctx->type == static_tracepoint)
+ {
+ struct static_tracepoint_ctx *sctx = (struct static_tracepoint_ctx *) ctx;
+ if (!sctx->regcache_initted)
+ {
+ sctx->regcache_initted = 1;
+ init_register_cache (&sctx->regcache, sctx->regspace);
+ supply_regblock (&sctx->regcache, NULL);
+ /* Pass down the tracepoint address, because REGS doesn't
+ include the PC, but we know what it must have been. */
+ supply_static_tracepoint_registers (&sctx->regcache,
+ (const unsigned char *)
+ sctx->regs,
+ sctx->tpoint->address);
+ }
+ regcache = &sctx->regcache;
+ }
+#endif
#else
if (ctx->type == trap_tracepoint)
{
@@ -3910,6 +4196,18 @@ do_action_at_tracepoint (struct tracepoi
}
}
break;
+ case 'L':
+ {
+#if defined IN_PROCESS_AGENT && defined HAVE_UST
+ trace_debug ("Want to collect static trace data");
+ collect_ust_data_at_tracepoint (ctx, stop_pc,
+ tpoint, tframe);
+#else
+ trace_debug ("warning: collecting static trace data, "
+ "but static tracepoints are not supported");
+#endif
+ }
+ break;
default:
trace_debug ("unknown trace action '%c', ignoring", taction->type);
break;
@@ -4494,6 +4792,11 @@ traceframe_find_block_type (unsigned cha
/* Skip over the TSV block. */
dataptr += (sizeof (int) + sizeof (LONGEST));
break;
+ case 'S':
+ /* Skip over the static trace data block. */
+ memcpy (&mlen, dataptr, sizeof (mlen));
+ dataptr += (sizeof (mlen) + mlen);
+ break;
default:
trace_debug ("traceframe %d has unknown block type 0x%x",
tfnum, blocktype);
@@ -4684,6 +4987,59 @@ traceframe_read_tsv (int tsvnum, LONGEST
return 1;
}
+/* Read a requested block of static tracepoint data from a trace
+ frame. */
+
+int
+traceframe_read_sdata (int tfnum, ULONGEST offset,
+ unsigned char *buf, ULONGEST length,
+ ULONGEST *nbytes)
+{
+ struct traceframe *tframe;
+ unsigned char *database, *dataptr;
+ unsigned int datasize;
+ unsigned short mlen;
+
+ trace_debug ("traceframe_read_sdata");
+
+ tframe = find_traceframe (tfnum);
+
+ if (!tframe)
+ {
+ trace_debug ("traceframe %d not found", tfnum);
+ return 1;
+ }
+
+ datasize = tframe->data_size;
+ database = &tframe->data[0];
+
+ /* Iterate through a traceframe's blocks, looking for static
+ tracepoint data. */
+ dataptr = traceframe_find_block_type (database, datasize,
+ tfnum, 'S');
+ if (dataptr != NULL)
+ {
+ memcpy (&mlen, dataptr, sizeof (mlen));
+ dataptr += sizeof (mlen);
+ if (offset < mlen)
+ {
+ if (offset + length > mlen)
+ length = mlen - offset;
+
+ memcpy (buf, dataptr, length);
+ *nbytes = length;
+ }
+ else
+ *nbytes = 0;
+ return 0;
+ }
+
+ trace_debug ("traceframe %d has no static trace data", tfnum);
+
+ *nbytes = 0;
+ return 0;
+}
+
/* Return the first fast tracepoint whose jump pad contains PC. */
static struct tracepoint *
@@ -5631,7 +5987,8 @@ download_tracepoints (void)
{
struct tracepoint target_tracepoint;
- if (tpoint->type != fast_tracepoint)
+ if (tpoint->type != fast_tracepoint
+ && tpoint->type != static_tracepoint)
continue;
/* Maybe download a compiled condition. */
@@ -5742,6 +6099,14 @@ download_tracepoints (void)
expr);
break;
}
+ case 'L':
+ ipa_action = target_malloc
+ (sizeof (struct collect_static_trace_data_action));
+ write_inferior_memory
+ (ipa_action,
+ (unsigned char *) action,
+ sizeof (struct collect_static_trace_data_action));
+ break;
default:
trace_debug ("unknown trace action '%c', ignoring",
action->type);
@@ -6087,20 +6452,901 @@ upload_fast_traceframes (void)
#ifdef IN_PROCESS_AGENT
-#include <sys/mman.h>
-#include <fcntl.h>
+IP_AGENT_EXPORT int ust_loaded;
+IP_AGENT_EXPORT char cmd_buf[CMD_BUF_SIZE];
-IP_AGENT_EXPORT char *gdb_tp_heap_buffer;
-IP_AGENT_EXPORT char *gdb_jump_pad_buffer;
-IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end;
+#ifdef HAVE_UST
-static void __attribute__ ((constructor))
-initialize_tracepoint_ftlib (void)
+/* Static tracepoints. */
+
+/* UST puts a "struct tracepoint" in the global namespace, which
+ conflicts with our tracepoint. Arguably, being a library, it
+ shouldn't take ownership of such a generic name. We work around it
+ here. */
+#define tracepoint ust_tracepoint
+#include <ust/ust.h>
+#undef tracepoint
+
+extern int serialize_to_text (char *outbuf, int bufsize,
+ const char *fmt, va_list ap);
+
+#define GDB_PROBE_NAME "gdb"
+
+/* We dynamically search for the UST symbols instead of linking them
+ in. This lets the user decide if the application uses static
+ tracepoints, instead of always pulling libust.so in. This vector
+ holds pointers to all functions we care about. */
+
+static struct
{
- initialize_tracepoint ();
+ int (*serialize_to_text) (char *outbuf, int bufsize,
+ const char *fmt, va_list ap);
+
+ int (*ltt_probe_register) (struct ltt_available_probe *pdata);
+ int (*ltt_probe_unregister) (struct ltt_available_probe *pdata);
+
+ int (*ltt_marker_connect) (const char *channel, const char *mname,
+ const char *pname);
+ int (*ltt_marker_disconnect) (const char *channel, const char *mname,
+ const char *pname);
+
+ void (*marker_iter_start) (struct marker_iter *iter);
+ void (*marker_iter_next) (struct marker_iter *iter);
+ void (*marker_iter_stop) (struct marker_iter *iter);
+ void (*marker_iter_reset) (struct marker_iter *iter);
+} ust_ops;
+
+#include <dlfcn.h>
+
+/* Cast through typeof to catch incompatible API changes. Since UST
+ only builds with gcc, we can freely use gcc extensions here
+ too. */
+#define GET_UST_SYM(SYM) \
+ do \
+ { \
+ if (ust_ops.SYM == NULL) \
+ ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
+ if (ust_ops.SYM == NULL) \
+ return 0; \
+ } while (0)
+
+#define USTF(SYM) ust_ops.SYM
+
+/* Get pointers to all libust.so functions we care about. */
+
+static int
+dlsym_ust (void)
+{
+ GET_UST_SYM (serialize_to_text);
+
+ GET_UST_SYM (ltt_probe_register);
+ GET_UST_SYM (ltt_probe_unregister);
+ GET_UST_SYM (ltt_marker_connect);
+ GET_UST_SYM (ltt_marker_disconnect);
+
+ GET_UST_SYM (marker_iter_start);
+ GET_UST_SYM (marker_iter_next);
+ GET_UST_SYM (marker_iter_stop);
+ GET_UST_SYM (marker_iter_reset);
+
+ ust_loaded = 1;
+ return 1;
}
-#endif
+/* Given an UST marker, return the matching gdb static tracepoint.
+ The match is done by address. */
+
+static struct tracepoint *
+ust_marker_to_static_tracepoint (const struct marker *mdata)
+{
+ struct tracepoint *tpoint;
+
+ for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
+ {
+ if (!tpoint->enabled || tpoint->type != static_tracepoint)
+ continue;
+
+ if (tpoint->address == (uintptr_t) mdata->location)
+ return tpoint;
+ }
+
+ return NULL;
+}
+
+/* The probe function we install on lttng/ust markers. Whenever a
+ probed ust marker is hit, this function is called. This is similar
+ to gdb_collect, only for static tracepoints, instead of fast
+ tracepoints. */
+
+static void
+gdb_probe (const struct marker *mdata, void *probe_private,
+ struct registers *regs, void *call_private,
+ const char *fmt, va_list *args)
+{
+ struct tracepoint *tpoint;
+ struct static_tracepoint_ctx ctx;
+
+ /* Don't do anything until the trace run is completely set up. */
+ if (!tracing)
+ {
+ trace_debug ("gdb_probe: not tracing\n");
+ return;
+ }
+
+ ctx.base.type = static_tracepoint;
+ ctx.regcache_initted = 0;
+ ctx.regs = regs;
+ ctx.fmt = fmt;
+ ctx.args = args;
+
+ /* Wrap the regblock in a register cache (in the stack, we don't
+ want to malloc here). */
+ ctx.regspace = alloca (register_cache_size ());
+ if (ctx.regspace == NULL)
+ {
+ trace_debug ("Trace buffer block allocation failed, skipping");
+ return;
+ }
+
+ tpoint = ust_marker_to_static_tracepoint (mdata);
+ if (tpoint == NULL)
+ {
+ trace_debug ("gdb_probe: marker not known: "
+ "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
+ mdata->location, mdata->channel,
+ mdata->name, mdata->format);
+ return;
+ }
+
+ ctx.tpoint = tpoint;
+
+ trace_debug ("gdb_probe: collecting marker: "
+ "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
+ mdata->location, mdata->channel,
+ mdata->name, mdata->format);
+
+ /* Test the condition if present, and collect if true. */
+ if (tpoint->cond == NULL
+ || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ tpoint))
+ {
+ collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
+ tpoint->address, tpoint);
+
+ if (stopping_tracepoint
+ || trace_buffer_is_full
+ || expr_eval_result != expr_eval_no_error)
+ stop_tracing ();
+ }
+ else
+ {
+ /* If there was a condition and it evaluated to false, the only
+ way we would stop tracing is if there was an error during
+ condition expression evaluation. */
+ if (expr_eval_result != expr_eval_no_error)
+ stop_tracing ();
+ }
+}
+
+/* Called if the gdb static tracepoint requested collecting "$_sdata",
+ static tracepoint string data. This is a string passed to the
+ tracing library by the user, at the time of the tracepoint marker
+ call. E.g., in the UST marker call:
+
+ trace_mark (ust, bar33, "str %s", "FOOBAZ");
+
+ the collected data is "str FOOBAZ".
+*/
+
+static void
+collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
+ CORE_ADDR stop_pc,
+ struct tracepoint *tpoint,
+ struct traceframe *tframe)
+{
+ struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx;
+ unsigned char *bufspace;
+ int size;
+ va_list copy;
+ unsigned short blocklen;
+
+ if (umd == NULL)
+ {
+ trace_debug ("Wanted to collect static trace data, "
+ "but there's no static trace data");
+ return;
+ }
+
+ va_copy (copy, *umd->args);
+ size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy);
+ va_end (copy);
+
+ trace_debug ("Want to collect ust data");
+
+ /* 'S' + size + string */
+ bufspace = add_traceframe_block (tframe,
+ 1 + sizeof (blocklen) + size + 1);
+ if (bufspace == NULL)
+ {
+ trace_debug ("Trace buffer block allocation failed, skipping");
+ return;
+ }
+
+ /* Identify a static trace data block. */
+ *bufspace = 'S';
+
+ blocklen = size + 1;
+ memcpy (bufspace + 1, &blocklen, sizeof (blocklen));
+
+ va_copy (copy, *umd->args);
+ USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen),
+ size + 1, umd->fmt, copy);
+ va_end (copy);
+
+ trace_debug ("Storing static tracepoint data in regblock: %s",
+ bufspace + 1 + sizeof (blocklen));
+}
+
+/* The probe to register with lttng/ust. */
+static struct ltt_available_probe gdb_ust_probe =
+ {
+ GDB_PROBE_NAME,
+ NULL,
+ gdb_probe,
+ };
+
+#endif /* HAVE_UST */
+#endif /* IN_PROCESS_AGENT */
+
+#ifdef HAVE_UST
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifndef UNIX_PATH_MAX
+#define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
+#endif
+
+/* Where we put the socked used for synchronization. */
+#define SOCK_DIR P_tmpdir
+
+#endif /* HAVE_UST */
+
+#ifndef IN_PROCESS_AGENT
+
+#ifdef HAVE_UST
+
+static int
+gdb_ust_connect_sync_socket (int pid)
+{
+ struct sockaddr_un addr;
+ int res, fd;
+ char path[UNIX_PATH_MAX];
+
+ res = snprintf (path, UNIX_PATH_MAX, "%s/gdb_ust%d", SOCK_DIR, pid);
+ if (res >= UNIX_PATH_MAX)
+ {
+ trace_debug ("string overflow allocating socket name");
+ return -1;
+ }
+
+ res = fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (res == -1)
+ {
+ warning ("error opening sync socket: %s\n", strerror (errno));
+ return -1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ res = snprintf (addr.sun_path, UNIX_PATH_MAX, "%s", path);
+ if (res >= UNIX_PATH_MAX)
+ {
+ warning ("string overflow allocating socket name\n");
+ close (fd);
+ return -1;
+ }
+
+ res = connect (fd, (struct sockaddr *) &addr, sizeof (addr));
+ if (res == -1)
+ {
+ warning ("error connecting sync socket (%s): %s. "
+ "Make sure the directory exists and that it is writable.",
+ path, strerror (errno));
+ close (fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+/* Resume thread PTID. */
+
+static void
+resume_thread (ptid_t ptid)
+{
+ struct thread_resume resume_info;
+
+ resume_info.thread = ptid;
+ resume_info.kind = resume_continue;
+ resume_info.sig = TARGET_SIGNAL_0;
+ (*the_target->resume) (&resume_info, 1);
+}
+
+/* Stop thread PTID. */
+
+static void
+stop_thread (ptid_t ptid)
+{
+ struct thread_resume resume_info;
+
+ resume_info.thread = ptid;
+ resume_info.kind = resume_stop;
+ resume_info.sig = TARGET_SIGNAL_0;
+ (*the_target->resume) (&resume_info, 1);
+}
+
+/* Ask the in-process agent to run a command. Since we don't want to
+ have to handle the IPA hitting breakpoints while running the
+ command, we pause all threads, remove all breakpoints, and then set
+ the helper thread re-running. We communicate with the helper
+ thread by means of direct memory xfering, and a socket for
+ synchronization. */
+
+static int
+run_inferior_command (char *cmd)
+{
+ int err = -1;
+ int fd = -1;
+ int pid = ptid_get_pid (current_inferior->entry.id);
+ int tid;
+ ptid_t ptid = null_ptid;
+
+ trace_debug ("run_inferior_command: running: %s", cmd);
+
+ pause_all (0);
+ uninsert_all_breakpoints ();
+
+ if (read_inferior_integer (ipa_sym_addrs.addr_helper_thread_id, &tid))
+ {
+ warning ("Error reading helper thread's id in lib");
+ goto out;
+ }
+
+ if (tid == 0)
+ {
+ warning ("helper thread not initialized yet");
+ goto out;
+ }
+
+ if (write_inferior_memory (ipa_sym_addrs.addr_cmd_buf,
+ (unsigned char *) cmd, strlen (cmd) + 1))
+ {
+ warning ("Error writing command");
+ goto out;
+ }
+
+ ptid = ptid_build (pid, tid, 0);
+
+ resume_thread (ptid);
+
+ fd = gdb_ust_connect_sync_socket (pid);
+ if (fd >= 0)
+ {
+ char buf[1] = "";
+ int ret;
+
+ trace_debug ("signalling helper thread");
+
+ do
+ {
+ ret = write (fd, buf, 1);
+ } while (ret == -1 && errno == EINTR);
+
+ trace_debug ("waiting for helper thread's response");
+
+ do
+ {
+ ret = read (fd, buf, 1);
+ } while (ret == -1 && errno == EINTR);
+
+ close (fd);
+
+ trace_debug ("helper thread's response received");
+ }
+
+ out:
+
+ /* Need to read response with the inferior stopped. */
+ if (!ptid_equal (ptid, null_ptid))
+ {
+ int was_non_stop = non_stop;
+ struct target_waitstatus status;
+
+ stop_thread (ptid);
+ non_stop = 1;
+ mywait (ptid, &status, 0, 0);
+ non_stop = was_non_stop;
+ }
+
+ if (fd >= 0)
+ {
+ if (read_inferior_memory (ipa_sym_addrs.addr_cmd_buf,
+ (unsigned char *) cmd, CMD_BUF_SIZE))
+ {
+ warning ("Error reading command response");
+ }
+ else
+ {
+ err = 0;
+ trace_debug ("run_inferior_command: response: %s", cmd);
+ }
+ }
+
+ reinsert_all_breakpoints ();
+ unpause_all (0);
+
+ return err;
+}
+
+#else /* HAVE_UST */
+
+static int
+run_inferior_command (char *cmd)
+{
+ return -1;
+}
+
+#endif /* HAVE_UST */
+
+#else /* !IN_PROCESS_AGENT */
+
+/* Thread ID of the helper thread. GDBserver reads this to know which
+ is the help thread. This is an LWP id on Linux. */
+int helper_thread_id;
+
+#ifdef HAVE_UST
+
+static int
+init_named_socket (const char *name)
+{
+ int result, fd;
+ struct sockaddr_un addr;
+
+ result = fd = socket (PF_UNIX, SOCK_STREAM, 0);
+ if (result == -1)
+ {
+ warning ("socket creation failed: %s", strerror (errno));
+ return -1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ strncpy (addr.sun_path, name, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
+
+ result = access (name, F_OK);
+ if (result == 0)
+ {
+ /* File exists. */
+ result = unlink (name);
+ if (result == -1)
+ {
+ warning ("unlink failed: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+ warning ("socket %s already exists; overwriting", name);
+ }
+
+ result = bind (fd, (struct sockaddr *) &addr, sizeof (addr));
+ if (result == -1)
+ {
+ warning ("bind failed: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+
+ result = listen (fd, 1);
+ if (result == -1)
+ {
+ warning ("listen: %s", strerror (errno));
+ close (fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+static int
+gdb_ust_socket_init (void)
+{
+ int result, fd;
+ char name[UNIX_PATH_MAX];
+
+ result = snprintf (name, UNIX_PATH_MAX, "%s/gdb_ust%d",
+ SOCK_DIR, getpid ());
+ if (result >= UNIX_PATH_MAX)
+ {
+ trace_debug ("string overflow allocating socket name");
+ return -1;
+ }
+
+ fd = init_named_socket (name);
+ if (fd < 0)
+ warning ("Error initializing named socket (%s) for communication with the "
+ "ust helper thread. Check that directory exists and that it "
+ "is writable.", name);
+
+ return fd;
+}
+
+/* Return an hexstr version of the STR C string, fit for sending to
+ GDB. */
+
+static char *
+cstr_to_hexstr (const char *str)
+{
+ int len = strlen (str);
+ char *hexstr = xmalloc (len * 2 + 1);
+ convert_int_to_ascii ((gdb_byte *) str, hexstr, len);
+ return hexstr;
+}
+
+/* The next marker to be returned on a qTsST command. */
+static const struct marker *next_st;
+
+/* Returns the first known marker. */
+
+struct marker *
+first_marker (void)
+{
+ struct marker_iter iter;
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+
+ return iter.marker;
+}
+
+/* Returns the marker following M. */
+
+const struct marker *
+next_marker (const struct marker *m)
+{
+ struct marker_iter iter;
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+
+ for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
+ {
+ if (iter.marker == m)
+ {
+ USTF(marker_iter_next) (&iter);
+ return iter.marker;
+ }
+ }
+
+ return NULL;
+}
+
+/* Compose packet that is the response to the qTsSTM/qTfSTM/qTST;at
+ packets. */
+
+static void
+response_ust_marker (char *packet, const struct marker *st)
+{
+ char *strid, *format, *tmp;
+
+ next_st = next_marker (st);
+
+ tmp = xmalloc (strlen (st->channel) + 1 +
+ strlen (st->name) + 1);
+ sprintf (tmp, "%s/%s", st->channel, st->name);
+
+ strid = cstr_to_hexstr (tmp);
+ free (tmp);
+
+ format = cstr_to_hexstr (st->format);
+
+ sprintf (packet, "m%s:%s:%s",
+ paddress ((uintptr_t) st->location),
+ strid,
+ format);
+
+ free (strid);
+ free (format);
+}
+
+/* Return the first static tracepoint, and initialize the state
+ machine that will iterate through all the static tracepoints. */
+
+static void
+cmd_qtfstm (char *packet)
+{
+ trace_debug ("Returning first trace state variable definition");
+
+ if (first_marker ())
+ response_ust_marker (packet, first_marker ());
+ else
+ strcpy (packet, "l");
+}
+
+/* Return additional trace state variable definitions. */
+
+static void
+cmd_qtsstm (char *packet)
+{
+ trace_debug ("Returning static tracepoint");
+
+ if (next_st)
+ response_ust_marker (packet, next_st);
+ else
+ strcpy (packet, "l");
+}
+
+/* Disconnect the GDB probe from a marker at a given address. */
+
+static void
+unprobe_marker_at (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+
+ p += sizeof ("unprobe_marker_at:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+ USTF(marker_iter_start) (&iter);
+ for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
+ if ((uintptr_t ) iter.marker->location == address)
+ {
+ int result;
+
+ result = USTF(ltt_marker_disconnect) (iter.marker->channel,
+ iter.marker->name,
+ GDB_PROBE_NAME);
+ if (result < 0)
+ warning ("could not disable marker %s/%s",
+ iter.marker->channel, iter.marker->name);
+ break;
+ }
+}
+
+/* Connect the GDB probe to a marker at a given address. */
+
+static int
+probe_marker_at (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+ struct marker *m;
+
+ p += sizeof ("probe_marker_at:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+
+ for (USTF(marker_iter_start) (&iter), m = iter.marker;
+ m != NULL;
+ USTF(marker_iter_next) (&iter), m = iter.marker)
+ if ((uintptr_t ) m->location == address)
+ {
+ int result;
+
+ trace_debug ("found marker for address. "
+ "ltt_marker_connect (marker = %s/%s)",
+ m->channel, m->name);
+
+ result = USTF(ltt_marker_connect) (m->channel, m->name, GDB_PROBE_NAME);
+ if (result && result != -EEXIST)
+ trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
+ m->channel, m->name, -result);
+
+ if (result < 0)
+ {
+ sprintf (packet, "E.could not connect marker: channel=%s, name=%s",
+ m->channel, m->name);
+ return -1;
+ }
+
+ strcpy (packet, "OK");
+ return 0;
+ }
+
+ sprintf (packet, "E.no marker found at 0x%s", paddress (address));
+ return -1;
+}
+
+static int
+cmd_qtstmat (char *packet)
+{
+ char *p = packet;
+ ULONGEST address;
+ struct marker_iter iter;
+ struct marker *m;
+
+ p += sizeof ("qTSTMat:") - 1;
+
+ p = unpack_varlen_hex (p, &address);
+
+ USTF(marker_iter_reset) (&iter);
+
+ for (USTF(marker_iter_start) (&iter), m = iter.marker;
+ m != NULL;
+ USTF(marker_iter_next) (&iter), m = iter.marker)
+ if ((uintptr_t ) m->location == address)
+ {
+ response_ust_marker (packet, m);
+ return 0;
+ }
+
+ strcpy (packet, "l");
+ return -1;
+}
+
+static void *
+gdb_ust_thread (void *arg)
+{
+ int listen_fd;
+
+ while (1)
+ {
+ listen_fd = gdb_ust_socket_init ();
+
+#ifdef SYS_gettid
+ if (helper_thread_id == 0)
+ helper_thread_id = syscall (SYS_gettid);
+#endif
+
+ if (listen_fd == -1)
+ {
+ warning ("could not create sync socket\n");
+ break;
+ }
+
+ while (1)
+ {
+ socklen_t tmp;
+ struct sockaddr_un sockaddr;
+ int fd;
+ char buf[1];
+ int ret;
+
+ tmp = sizeof (sockaddr);
+
+ do
+ {
+ fd = accept (listen_fd, &sockaddr, &tmp);
+ }
+ /* It seems an ERESTARTSYS can escape out of accept. */
+ while (fd == -512 || (fd == -1 && errno == EINTR));
+
+ if (fd < 0)
+ {
+ warning ("Accept returned %d, error: %s\n",
+ fd, strerror (errno));
+ break;
+ }
+
+ do
+ {
+ ret = read (fd, buf, 1);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1)
+ {
+ warning ("reading socket (fd=%d) failed with %s",
+ fd, strerror (errno));
+ close (fd);
+ break;
+ }
+
+ if (cmd_buf[0])
+ {
+ if (strcmp ("qTfSTM", cmd_buf) == 0)
+ {
+ cmd_qtfstm (cmd_buf);
+ }
+ else if (strcmp ("qTsSTM", cmd_buf) == 0)
+ {
+ cmd_qtsstm (cmd_buf);
+ }
+ else if (strncmp ("unprobe_marker_at:",
+ cmd_buf,
+ sizeof ("unprobe_marker_at:") - 1) == 0)
+ {
+ unprobe_marker_at (cmd_buf);
+ }
+ else if (strncmp ("probe_marker_at:",
+ cmd_buf,
+ sizeof ("probe_marker_at:") - 1) == 0)
+ {
+ probe_marker_at (cmd_buf);
+ }
+ else if (strncmp ("qTSTMat:",
+ cmd_buf,
+ sizeof ("qTSTMat:") - 1) == 0)
+ {
+ cmd_qtstmat (cmd_buf);
+ }
+ else if (strcmp (cmd_buf, "help") == 0)
+ {
+ strcpy (cmd_buf, "for help, press F1\n");
+ }
+ else
+ strcpy (cmd_buf, "");
+ }
+
+ write (fd, buf, 1);
+ close (fd);
+ }
+ }
+
+ return NULL;
+}
+
+#include <signal.h>
+
+static void
+gdb_ust_init (void)
+{
+ int res;
+ pthread_t thread;
+ sigset_t new_mask;
+ sigset_t orig_mask;
+
+ if (!dlsym_ust ())
+ return;
+
+ /* We want the helper thread to be as transparent as possible, so
+ have it inherit an all-signals-blocked mask. */
+
+ sigfillset (&new_mask);
+ res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask);
+ if (res)
+ fatal ("pthread_sigmask (1) failed: %s", strerror (res));
+
+ res = pthread_create (&thread,
+ NULL,
+ gdb_ust_thread,
+ NULL);
+
+ res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL);
+ if (res)
+ fatal ("pthread_sigmask (2) failed: %s", strerror (res));
+
+ while (helper_thread_id == 0)
+ usleep (1);
+
+ USTF(ltt_probe_register) (&gdb_ust_probe);
+}
+
+#endif /* HAVE_UST */
+
+#include <sys/mman.h>
+#include <fcntl.h>
+
+IP_AGENT_EXPORT char *gdb_tp_heap_buffer;
+IP_AGENT_EXPORT char *gdb_jump_pad_buffer;
+IP_AGENT_EXPORT char *gdb_jump_pad_buffer_end;
+
+static void __attribute__ ((constructor))
+initialize_tracepoint_ftlib (void)
+{
+ initialize_tracepoint ();
+
+#ifdef HAVE_UST
+ gdb_ust_init ();
+#endif
+}
+
+#endif /* IN_PROCESS_AGENT */
static LONGEST
tsv_get_timestamp (void)
Index: src/gdb/breakpoint.c
===================================================================
--- src.orig/gdb/breakpoint.c 2010-06-29 21:13:13.000000000 +0100
+++ src/gdb/breakpoint.c 2010-06-29 21:42:05.000000000 +0100
@@ -228,6 +228,11 @@ static void disable_trace_command (char
static void trace_pass_command (char *, int);
+/* Assuming we're creating a static tracepoint, does S look like a
+ static tracepoint marker spec ("-m MARKER_ID")? */
+#define is_marker_spec(s) \
+ (strncmp (s, "-m", 2) == 0 && ((s)[2] == ' ' || (s)[2] == '\t'))
+
/* A reference-counted struct command_line. This lets multiple
breakpoints share a single command list. */
struct counted_command_line
@@ -837,7 +842,9 @@ check_no_tracepoint_commands (struct com
int
is_tracepoint (const struct breakpoint *b)
{
- return (b->type == bp_tracepoint || b->type == bp_fast_tracepoint);
+ return (b->type == bp_tracepoint
+ || b->type == bp_fast_tracepoint
+ || b->type == bp_static_tracepoint);
}
/* A helper function that validsates that COMMANDS are valid for a
@@ -861,7 +868,11 @@ validate_commands_for_breakpoint (struct
if (c->control_type == while_stepping_control)
{
if (b->type == bp_fast_tracepoint)
- error (_("The 'while-stepping' command cannot be used for fast tracepoint"));
+ error (_("\
+The 'while-stepping' command cannot be used for fast tracepoint"));
+ else if (b->type == bp_static_tracepoint)
+ error (_("\
+The 'while-stepping' command cannot be used for static tracepoint"));
if (while_stepping)
error (_("The 'while-stepping' command can be used only once"));
@@ -888,6 +899,27 @@ validate_commands_for_breakpoint (struct
}
}
+/* Return a vector of all the static tracepoints set at ADDR. The
+ caller is responsible for releasing the vector. */
+
+VEC(breakpoint_p) *
+static_tracepoints_here (CORE_ADDR addr)
+{
+ struct breakpoint *b;
+ VEC(breakpoint_p) *found = 0;
+ struct bp_location *loc;
+
+ ALL_BREAKPOINTS (b)
+ if (b->type == bp_static_tracepoint)
+ {
+ for (loc = b->loc; loc; loc = loc->next)
+ if (loc->address == addr)
+ VEC_safe_push(breakpoint_p, found, b);
+ }
+
+ return found;
+}
+
/* Set the command list of B to COMMANDS. If breakpoint is tracepoint,
validate that only allowed commands are included.
*/
@@ -4420,6 +4452,7 @@ bpstat_what (bpstat bs)
break;
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
/* Tracepoint hits should not be reported back to GDB, and
if one got through somehow, it should have been filtered
out already. */
@@ -4553,6 +4586,7 @@ print_one_breakpoint_location (struct br
{bp_catchpoint, "catchpoint"},
{bp_tracepoint, "tracepoint"},
{bp_fast_tracepoint, "fast tracepoint"},
+ {bp_static_tracepoint, "static tracepoint"},
{bp_jit_event, "jit events"},
};
@@ -4685,6 +4719,7 @@ print_one_breakpoint_location (struct br
case bp_std_terminate_master:
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
case bp_jit_event:
if (opts.addressprint)
{
@@ -4755,6 +4790,16 @@ print_one_breakpoint_location (struct br
ui_out_text (uiout, "\n");
+ if (!part_of_multiple && b->static_trace_marker_id)
+ {
+ gdb_assert (b->type == bp_static_tracepoint);
+
+ ui_out_text (uiout, "\tmarker id is ");
+ ui_out_field_string (uiout, "static-tracepoint-marker-string-id",
+ b->static_trace_marker_id);
+ ui_out_text (uiout, "\n");
+ }
+
if (part_of_multiple && frame_id_p (b->frame_id))
{
annotate_field (6);
@@ -5411,6 +5456,7 @@ allocate_bp_location (struct breakpoint
case bp_catchpoint:
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
loc->loc_type = bp_loc_other;
break;
default:
@@ -6787,6 +6833,16 @@ mention (struct breakpoint *b)
printf_filtered (_(" %d"), b->number);
say_where = 1;
break;
+ case bp_static_tracepoint:
+ if (ui_out_is_mi_like_p (uiout))
+ {
+ say_where = 0;
+ break;
+ }
+ printf_filtered (_("Static tracepoint"));
+ printf_filtered (_(" %d"), b->number);
+ say_where = 1;
+ break;
case bp_until:
case bp_finish:
@@ -6966,9 +7022,47 @@ create_breakpoint_sal (struct gdbarch *g
b->ignore_count = ignore_count;
b->enable_state = enabled ? bp_enabled : bp_disabled;
b->disposition = disposition;
-
b->pspace = sals.sals[0].pspace;
+ if (type == bp_static_tracepoint)
+ {
+ struct static_tracepoint_marker marker;
+
+ if (is_marker_spec (addr_string))
+ {
+ /* We already know the marker exists, otherwise, we
+ wouldn't see a sal for it. */
+ char *p = &addr_string[3];
+ char *endp;
+ char *marker_str;
+ int i;
+
+ while (*p == ' ' || *p == '\t')
+ p++;
+
+ endp = p;
+ while (*endp != ' ' && *endp != '\t' && *endp != '\0')
+ endp++;
+
+ marker_str = savestring (p, endp - p);
+ b->static_trace_marker_id = marker_str;
+
+ printf_filtered (_("Probed static tracepoint marker \"%s\"\n"),
+ b->static_trace_marker_id);
+ }
+ else if (target_static_tracepoint_marker_at (sal.pc, &marker))
+ {
+ b->static_trace_marker_id = xstrdup (marker.str_id);
+ release_static_tracepoint_marker (&marker);
+
+ printf_filtered (_("Probed static tracepoint marker \"%s\"\n"),
+ b->static_trace_marker_id);
+ }
+ else
+ warning (_("\
+Couldn't determine the static tracepoint marker to probe"));
+ }
+
if (enabled && b->pspace->executing_startup
&& (b->type == bp_breakpoint
|| b->type == bp_hardware_breakpoint))
@@ -7381,6 +7475,58 @@ find_condition_and_thread (char *tok, CO
}
}
+/* Decode a static tracepoint marker spec. */
+
+static struct symtabs_and_lines
+decode_static_tracepoint_spec (char **arg_p)
+{
+ VEC(static_tracepoint_marker_p) *markers = NULL;
+ struct symtabs_and_lines sals;
+ struct symtab_and_line sal;
+ struct symbol *sym;
+ struct cleanup *old_chain;
+ char *p = &(*arg_p)[3];
+ char *endp;
+ char *marker_str;
+ int i;
+
+ while (*p == ' ' || *p == '\t')
+ p++;
+
+ endp = p;
+ while (*endp != ' ' && *endp != '\t' && *endp != '\0')
+ endp++;
+
+ marker_str = savestring (p, endp - p);
+ old_chain = make_cleanup (xfree, marker_str);
+
+ markers = target_static_tracepoint_markers_by_strid (marker_str);
+ if (VEC_empty(static_tracepoint_marker_p, markers))
+ error (_("No known static tracepoint marker named %s"), marker_str);
+
+ sals.nelts = VEC_length(static_tracepoint_marker_p, markers);
+ sals.sals = xmalloc (sizeof *sals.sals * sals.nelts);
+
+ for (i = 0; i < sals.nelts; i++)
+ {
+ struct static_tracepoint_marker *marker;
+
+ marker = VEC_index (static_tracepoint_marker_p, markers, i);
+
+ init_sal (&sals.sals[i]);
+
+ sals.sals[i] = find_pc_line (marker->address, 0);
+ sals.sals[i].pc = marker->address;
+
+ release_static_tracepoint_marker (marker);
+ }
+
+ do_cleanups (old_chain);
+
+ *arg_p = endp;
+ return sals;
+}
+
/* Set a breakpoint. This function is shared between CLI and MI
functions for setting a breakpoint. This function has two major
modes of operations, selected by the PARSE_CONDITION_AND_THREAD
@@ -7394,7 +7540,7 @@ int
create_breakpoint (struct gdbarch *gdbarch,
char *arg, char *cond_string, int thread,
int parse_condition_and_thread,
- int tempflag, int hardwareflag, int traceflag,
+ int tempflag, enum bptype type_wanted,
int ignore_count,
enum auto_boolean pending_break_support,
struct breakpoint_ops *ops,
@@ -7413,7 +7559,6 @@ create_breakpoint (struct gdbarch *gdbar
int i;
int pending = 0;
int not_found = 0;
- enum bptype type_wanted;
int task = 0;
int prev_bkpt_count = breakpoint_count;
@@ -7426,6 +7571,19 @@ create_breakpoint (struct gdbarch *gdbar
parse_args.addr_string_p = &addr_string;
parse_args.not_found_ptr = ¬_found;
+ if (type_wanted == bp_static_tracepoint && is_marker_spec (arg))
+ {
+ int i;
+
+ sals = decode_static_tracepoint_spec (&arg);
+
+ copy_arg = savestring (addr_start, arg - addr_start);
+ addr_string = xcalloc (sals.nelts, sizeof (char **));
+ for (i = 0; i < sals.nelts; i++)
+ addr_string[i] = xstrdup (copy_arg);
+ goto done;
+ }
+
e = catch_exception (uiout, do_captured_parse_breakpoint,
&parse_args, RETURN_MASK_ALL);
@@ -7472,6 +7630,8 @@ create_breakpoint (struct gdbarch *gdbar
return 0;
}
+ done:
+
/* Create a chain of things that always need to be cleaned up. */
old_chain = make_cleanup (null_cleanup, 0);
@@ -7503,10 +7663,6 @@ create_breakpoint (struct gdbarch *gdbar
if (!pending)
breakpoint_sals_to_pc (&sals, addr_start);
- type_wanted = (traceflag
- ? (hardwareflag ? bp_fast_tracepoint : bp_tracepoint)
- : (hardwareflag ? bp_hardware_breakpoint : bp_breakpoint));
-
/* Fast tracepoints may have additional restrictions on location. */
if (type_wanted == bp_fast_tracepoint)
check_fast_tracepoint_sals (gdbarch, &sals);
@@ -7538,10 +7694,55 @@ create_breakpoint (struct gdbarch *gdbar
make_cleanup (xfree, cond_string);
}
}
- create_breakpoints_sal (gdbarch, sals, addr_string, cond_string,
- type_wanted, tempflag ? disp_del : disp_donttouch,
- thread, task, ignore_count, ops, from_tty,
- enabled);
+
+ /* If the user is creating a static tracepoint by marker id
+ (strace -m MARKER_ID), then store the sals index, so that
+ breakpoint_re_set can try to match up which of the newly
+ found markers corresponds to this one, and, don't try to
+ expand multiple locations for each sal, given than SALS
+ already should contain all sals for MARKER_ID. */
+ if (type_wanted == bp_static_tracepoint
+ && is_marker_spec (addr_string[0]))
+ {
+ int i;
+
+ for (i = 0; i < sals.nelts; ++i)
+ {
+ struct symtabs_and_lines expanded;
+ struct breakpoint *tp;
+ struct cleanup *old_chain;
+
+ expanded.nelts = 1;
+ expanded.sals = xmalloc (sizeof (struct symtab_and_line));
+ expanded.sals[0] = sals.sals[i];
+ old_chain = make_cleanup (xfree, expanded.sals);
+
+ create_breakpoint_sal (gdbarch, expanded, addr_string[i],
+ cond_string, type_wanted,
+ tempflag ? disp_del : disp_donttouch,
+ thread, task, ignore_count, ops,
+ from_tty, enabled);
+
+ do_cleanups (old_chain);
+
+ /* Get the tracepoint we just created. */
+ tp = get_breakpoint (breakpoint_count);
+ gdb_assert (tp != NULL);
+
+ /* Given that its possible to have multiple markers with
+ the same string id, if the user is creating a static
+ tracepoint by marker id ("strace -m MARKER_ID"), then
+ store the sals index, so that breakpoint_re_set can
+ try to match up which of the newly found markers
+ corresponds to this one */
+ tp->static_trace_marker_id_idx = i;
+ }
+ }
+ else
+ create_breakpoints_sal (gdbarch, sals, addr_string, cond_string,
+ type_wanted, tempflag ? disp_del : disp_donttouch,
+ thread, task, ignore_count, ops, from_tty,
+ enabled);
}
else
{
@@ -7599,13 +7800,15 @@ create_breakpoint (struct gdbarch *gdbar
static void
break_command_1 (char *arg, int flag, int from_tty)
{
- int hardwareflag = flag & BP_HARDWAREFLAG;
int tempflag = flag & BP_TEMPFLAG;
+ enum bptype type_wanted = (flag & BP_HARDWAREFLAG
+ ? bp_hardware_breakpoint
+ : bp_breakpoint);
create_breakpoint (get_current_arch (),
arg,
NULL, 0, 1 /* parse arg */,
- tempflag, hardwareflag, 0 /* traceflag */,
+ tempflag, type_wanted,
0 /* Ignore count */,
pending_break_support,
NULL /* breakpoint_ops */,
@@ -8578,7 +8781,7 @@ handle_gnu_v3_exceptions (int tempflag,
create_breakpoint (get_current_arch (),
trigger_func_name, cond_string, -1,
0 /* condition and thread are valid. */,
- tempflag, 0, 0,
+ tempflag, bp_breakpoint,
0,
AUTO_BOOLEAN_TRUE /* pending */,
&gnu_v3_exception_catchpoint_ops, from_tty,
@@ -9630,6 +9833,139 @@ ambiguous_names_p (struct bp_location *l
return 0;
}
+/* When symbols change, it probably means the sources changed as well,
+ and it might mean the static tracepoint markers are no longer at
+ the same address or line numbers they used to be at last we
+ checked. Losing your static tracepoints whenever you rebuild is
+ undesirable. This function tries to resync/rematch gdb static
+ tracepoints with the markers on the target, for static tracepoints
+ that have not been set by marker id. Static tracepoint that have
+ been set by marker id are reset by marker id in breakpoint_re_set.
+ The heuristic is:
+
+ 1) For a tracepoint set at a specific address, look for a marker at
+ the old PC. If one is found there, assume to be the same marker.
+ If the name / string id of the marker found is different from the
+ previous known name, assume that means the user renamed the marker
+ in the sources, and output a warning.
+
+ 2) For a tracepoint set at a given line number, look for a marker
+ at the new address of the old line number. If one is found there,
+ assume to be the same marker. If the name / string id of the
+ marker found is different from the previous known name, assume that
+ means the user renamed the marker in the sources, and output a
+ warning.
+
+ 3) If a marker is no longer found at the same address or line, it
+ may mean the marker no longer exists. But it may also just mean
+ the code changed a bit. Maybe the user added a few lines of code
+ that made the marker move up or down (in line number terms). Ask
+ the target for info about the marker with the string id as we knew
+ it. If found, update line number and address in the matching
+ static tracepoint. This will get confused if there's more than one
+ marker with the same ID (possible in UST, although unadvised
+ precisely because it confuses tools). */
+
+static struct symtab_and_line
+update_static_tracepoint (struct breakpoint *b, struct symtab_and_line sal)
+{
+ struct static_tracepoint_marker marker;
+ CORE_ADDR pc;
+ int i;
+
+ pc = sal.pc;
+ if (sal.line)
+ find_line_pc (sal.symtab, sal.line, &pc);
+
+ if (target_static_tracepoint_marker_at (pc, &marker))
+ {
+ if (strcmp (b->static_trace_marker_id, marker.str_id) != 0)
+ warning (_("static tracepoint %d changed probed marker from %s to %s"),
+ b->number,
+ b->static_trace_marker_id, marker.str_id);
+
+ xfree (b->static_trace_marker_id);
+ b->static_trace_marker_id = xstrdup (marker.str_id);
+ release_static_tracepoint_marker (&marker);
+
+ return sal;
+ }
+
+ /* Old marker wasn't found on target at lineno. Try looking it up
+ by string ID. */
+ if (!sal.explicit_pc
+ && sal.line != 0
+ && sal.symtab != NULL
+ && b->static_trace_marker_id != NULL)
+ {
+ VEC(static_tracepoint_marker_p) *markers;
+
+ markers
+ = target_static_tracepoint_markers_by_strid (b->static_trace_marker_id);
+
+ if (!VEC_empty(static_tracepoint_marker_p, markers))
+ {
+ struct symtab_and_line sal;
+ struct symbol *sym;
+ struct static_tracepoint_marker *marker;
+
+ marker = VEC_index (static_tracepoint_marker_p, markers, 0);
+
+ xfree (b->static_trace_marker_id);
+ b->static_trace_marker_id = xstrdup (marker->str_id);
+
+ warning (_("marker for static tracepoint %d (%s) not "
+ "found at previous line number"),
+ b->number, b->static_trace_marker_id);
+
+ init_sal (&sal);
+
+ sal.pc = marker->address;
+
+ sal = find_pc_line (marker->address, 0);
+ sym = find_pc_sect_function (marker->address, NULL);
+ ui_out_text (uiout, "Now in ");
+ if (sym)
+ {
+ ui_out_field_string (uiout, "func",
+ SYMBOL_PRINT_NAME (sym));
+ ui_out_text (uiout, " at ");
+ }
+ ui_out_field_string (uiout, "file", sal.symtab->filename);
+ ui_out_text (uiout, ":");
+
+ if (ui_out_is_mi_like_p (uiout))
+ {
+ char *fullname = symtab_to_fullname (sal.symtab);
+
+ if (fullname)
+ ui_out_field_string (uiout, "fullname", fullname);
+ }
+
+ ui_out_field_int (uiout, "line", sal.line);
+ ui_out_text (uiout, "\n");
+
+ b->line_number = sal.line;
+
+ xfree (b->source_file);
+ if (sym)
+ b->source_file = xstrdup (sal.symtab->filename);
+ else
+ b->source_file = NULL;
+
+ xfree (b->addr_string);
+ b->addr_string = xstrprintf ("%s:%d",
+ sal.symtab->filename, b->line_number);
+
+ /* Might be nice to check if function changed, and warn if
+ so. */
+
+ release_static_tracepoint_marker (marker);
+ }
+ }
+ return sal;
+}
+
static void
update_breakpoint_locations (struct breakpoint *b,
struct symtabs_and_lines sals)
@@ -9732,7 +10068,6 @@ update_breakpoint_locations (struct brea
update_global_location_list (1);
}
-
/* Reset a breakpoint given it's struct breakpoint * BINT.
The value we return ends up being the return value from catch_errors.
Unused in this case. */
@@ -9749,6 +10084,7 @@ breakpoint_re_set_one (void *bint)
char *s;
struct gdb_exception e;
struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
+ int marker_spec = 0;
switch (b->type)
{
@@ -9760,6 +10096,7 @@ breakpoint_re_set_one (void *bint)
case bp_hardware_breakpoint:
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
/* Do not attempt to re-set breakpoints disabled during startup. */
if (b->enable_state == bp_startup_disabled)
return 0;
@@ -9778,10 +10115,24 @@ breakpoint_re_set_one (void *bint)
save_current_space_and_thread ();
switch_to_program_space_and_thread (b->pspace);
+ marker_spec = b->type == bp_static_tracepoint && is_marker_spec (s);
+
TRY_CATCH (e, RETURN_MASK_ERROR)
{
- sals = decode_line_1 (&s, 1, (struct symtab *) NULL, 0, (char ***) NULL,
- not_found_ptr);
+ if (marker_spec)
+ {
+ sals = decode_static_tracepoint_spec (&s);
+ if (sals.nelts > b->static_trace_marker_id_idx)
+ {
+ sals.sals[0] = sals.sals[b->static_trace_marker_id_idx];
+ sals.nelts = 1;
+ }
+ else
+ error (_("marker %s not found"), b->static_trace_marker_id);
+ }
+ else
+ sals = decode_line_1 (&s, 1, (struct symtab *) NULL, 0, (char ***) NULL,
+ not_found_ptr);
}
if (e.reason < 0)
{
@@ -9831,6 +10182,9 @@ breakpoint_re_set_one (void *bint)
b->condition_not_parsed = 0;
}
+ if (b->type == bp_static_tracepoint && !marker_spec)
+ sals.sals[0] = update_static_tracepoint (b, sals.sals[0]);
+
expanded = expand_line_sal_maybe (sals.sals[0]);
}
@@ -10183,6 +10537,7 @@ disable_command (char *args, int from_tt
case bp_breakpoint:
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
case bp_catchpoint:
case bp_hardware_breakpoint:
case bp_watchpoint:
@@ -10283,6 +10638,7 @@ enable_command (char *args, int from_tty
case bp_breakpoint:
case bp_tracepoint:
case bp_fast_tracepoint:
+ case bp_static_tracepoint:
case bp_catchpoint:
case bp_hardware_breakpoint:
case bp_watchpoint:
@@ -10583,8 +10939,8 @@ trace_command (char *arg, int from_tty)
if (create_breakpoint (get_current_arch (),
arg,
NULL, 0, 1 /* parse arg */,
- 0 /* tempflag */, 0 /* hardwareflag */,
- 1 /* traceflag */,
+ 0 /* tempflag */,
+ bp_tracepoint /* type_wanted */,
0 /* Ignore count */,
pending_break_support,
NULL,
@@ -10599,8 +10955,26 @@ ftrace_command (char *arg, int from_tty)
if (create_breakpoint (get_current_arch (),
arg,
NULL, 0, 1 /* parse arg */,
- 0 /* tempflag */, 1 /* hardwareflag */,
- 1 /* traceflag */,
+ 0 /* tempflag */,
+ bp_fast_tracepoint /* type_wanted */,
+ 0 /* Ignore count */,
+ pending_break_support,
+ NULL,
+ from_tty,
+ 1 /* enabled */))
+ set_tracepoint_count (breakpoint_count);
+}
+
+/* strace command implementation. Creates a static tracepoint. */
+
+void
+strace_command (char *arg, int from_tty)
+{
+ if (create_breakpoint (get_current_arch (),
+ arg,
+ NULL, 0, 1 /* parse arg */,
+ 0 /* tempflag */,
+ bp_static_tracepoint /* type_wanted */,
0 /* Ignore count */,
pending_break_support,
NULL,
@@ -10662,8 +11036,7 @@ create_tracepoint_from_upload (struct up
addr_str,
utp->cond_string, -1, 0 /* parse cond/thread */,
0 /* tempflag */,
- (utp->type == bp_fast_tracepoint) /* hardwareflag */,
- 1 /* traceflag */,
+ utp->type /* type_wanted */,
0 /* Ignore count */,
pending_break_support,
NULL,
@@ -10985,6 +11358,8 @@ save_breakpoints (char *filename, int fr
{
if (tp->type == bp_fast_tracepoint)
fprintf_unfiltered (fp, "ftrace");
+ if (tp->type == bp_static_tracepoint)
+ fprintf_unfiltered (fp, "strace");
else if (tp->type == bp_tracepoint)
fprintf_unfiltered (fp, "trace");
else if (tp->type == bp_breakpoint && tp->disposition == disp_del)
@@ -11569,6 +11944,31 @@ BREAK_ARGS_HELP ("ftrace") "\n\
Do \"help tracepoints\" for info on other tracepoint commands."));
set_cmd_completer (c, location_completer);
+ c = add_com ("strace", class_breakpoint, strace_command, _("\
+Set a static tracepoint at specified line, function or marker.\n\
+\n\
+strace [LOCATION] [if CONDITION]\n\
+LOCATION may be a line number, function name, \"*\" and an address,\n\
+or -m MARKER_ID.\n\
+If a line number is specified, probe the marker at start of code\n\
+for that line. If a function is specified, probe the marker at start\n\
+of code for that function. If an address is specified, probe the marker\n\
+at that exact address. If a marker id is specified, probe the marker\n\
+with that name. With no LOCATION, uses current execution address of\n\
+the selected stack frame.\n\
+Static tracepoints accept an extra collect action -- ``collect $_sdata''.\n\
+This collects arbitrary user data passed in the probe point call to the\n\
+tracing library. You can inspect it when analyzing the trace buffer,\n\
+by printing the $_sdata variable like any other convenience variable.\n\
+\n\
+CONDITION is a boolean expression.\n\
+\n\
+Multiple tracepoints at one place are permitted, and useful if conditional.\n\
+\n\
+Do \"help breakpoints\" for info on other commands dealing with breakpoints.\n\
+Do \"help tracepoints\" for info on other tracepoint commands."));
+ set_cmd_completer (c, location_completer);
+
add_info ("tracepoints", tracepoints_info, _("\
Status of tracepoints, or tracepoint number NUMBER.\n\
Convenience variable \"$tpnum\" contains the number of the\n\
Index: src/gdb/breakpoint.h
===================================================================
--- src.orig/gdb/breakpoint.h 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/breakpoint.h 2010-06-29 21:43:54.000000000 +0100
@@ -129,6 +129,7 @@ enum bptype
bp_tracepoint,
bp_fast_tracepoint,
+ bp_static_tracepoint,
/* Event for JIT compiled code generation or deletion. */
bp_jit_event,
@@ -536,6 +537,18 @@ struct breakpoint
/* The number of the tracepoint on the target. */
int number_on_target;
+
+ /* The static tracepoint marker id, if known. */
+ char *static_trace_marker_id;
+
+ /* LTTng/UST allow more than one marker with the same ID string,
+ although it unadvised because it confuses tools. When setting
+ static tracepoints by marker ID, this will record the index in
+ the array of markers we found for the given marker ID for which
+ this static tracepoint corresponds. When resetting
+ breakpoints, we will use this index to try to find the same
+ marker again. */
+ int static_trace_marker_id_idx;
};
typedef struct breakpoint *breakpoint_p;
@@ -818,7 +831,7 @@ extern void tbreak_command (char *, int)
extern int create_breakpoint (struct gdbarch *gdbarch, char *arg,
char *cond_string, int thread,
int parse_condition_and_thread,
- int tempflag, int hardwareflag, int traceflag,
+ int tempflag, enum bptype wanted_type,
int ignore_count,
enum auto_boolean pending_break_support,
struct breakpoint_ops *ops,
@@ -1040,6 +1053,11 @@ extern VEC(breakpoint_p) *all_tracepoint
extern int is_tracepoint (const struct breakpoint *b);
+/* Return a vector of all static tracepoints defined at ADDR. The
+ vector is newly allocated; the caller should free when done with
+ it. */
+extern VEC(breakpoint_p) *static_tracepoints_here (CORE_ADDR addr);
+
/* Function that can be passed to read_command_line to validate
that each command is suitable for tracepoint command list. */
extern void check_tracepoint_command (char *line, void *closure);
Index: src/gdb/gdbserver/config.in
===================================================================
--- src.orig/gdb/gdbserver/config.in 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/config.in 2010-06-29 21:42:05.000000000 +0100
@@ -154,6 +154,9 @@
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
+/* Define if UST is available */
+#undef HAVE_UST
+
/* Checking if errno must be defined */
#undef MUST_DEFINE_ERRNO
Index: src/gdb/gdbserver/configure
===================================================================
--- src.orig/gdb/gdbserver/configure 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/configure 2010-06-29 21:42:05.000000000 +0100
@@ -601,6 +601,8 @@ RDYNAMIC
REPORT_BUGS_TEXI
REPORT_BUGS_TO
PKGVERSION
+ustinc
+ustlibs
LIBOBJS
INSTALL_DATA
INSTALL_SCRIPT
@@ -668,6 +670,9 @@ SHELL'
ac_subst_files=''
ac_user_opts='
enable_option_checking
+with_ust
+with_ust_include
+with_ust_lib
with_pkgversion
with_bugurl
with_libthread_db
@@ -1298,6 +1303,11 @@ if test -n "$ac_init_help"; then
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
+ --with-ust=PATH Specify prefix directory for the installed UST package
+ Equivalent to --with-ust-include=PATH/include
+ plus --with-ust-lib=PATH/lib
+ --with-ust-include=PATH Specify directory for installed UST include files
+ --with-ust-lib=PATH Specify the directory for the installed UST library
--with-pkgversion=PKG Use PKG in the version string in place of "GDB"
--with-bugurl=URL Direct users to URL to report a bug
--with-libthread-db=PATH
@@ -1747,8 +1757,10 @@ $as_echo "$ac_res" >&6; }
ac_fn_c_check_decl ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $2 is declared" >&5
-$as_echo_n "checking whether $2 is declared... " >&6; }
+ as_decl_name=`echo $2|sed 's/ *(.*//'`
+ as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
+$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
$as_echo_n "(cached) " >&6
else
@@ -1758,8 +1770,12 @@ $4
int
main ()
{
-#ifndef $2
- (void) $2;
+#ifndef $as_decl_name
+#ifdef __cplusplus
+ (void) $as_decl_use;
+#else
+ (void) $as_decl_name;
+#endif
#endif
;
@@ -3818,6 +3834,86 @@ done
+# Check for UST
+ustlibs=""
+ustinc=""
+
+
+# Check whether --with-ust was given.
+if test "${with_ust+set}" = set; then :
+ withval=$with_ust;
+fi
+
+
+# Check whether --with-ust_include was given.
+if test "${with_ust_include+set}" = set; then :
+ withval=$with_ust_include;
+fi
+
+
+# Check whether --with-ust_lib was given.
+if test "${with_ust_lib+set}" = set; then :
+ withval=$with_ust_lib;
+fi
+
+
+case $with_ust in
+ no)
+ ustlibs=
+ ustinc=
+ ;;
+ "" | yes)
+ ustlibs=" -lust "
+ ustinc=""
+ ;;
+ *)
+ ustlibs="-L$with_ust/lib -lust"
+ ustinc="-I$with_ust/include "
+ ;;
+esac
+if test "x$with_ust_include" != x; then
+ ustinc="-I$with_ust_include "
+fi
+if test "x$with_ust_lib" != x; then
+ ustlibs="-L$with_ust_lib -lust"
+fi
+
+if test "x$with_ust" != "xno"; then
+ saved_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $ustinc"
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ust" >&5
+$as_echo_n "checking for ust... " >&6; }
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+#define CONFIG_UST_GDB_INTEGRATION
+#include <ust/ust.h>
+
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+$as_echo "#define HAVE_UST 1" >>confdefs.h
+
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }; ustlibs= ; ustinc=
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ CFLAGS="$saved_CFLAGS"
+fi
+
+# Flags needed for UST
+
+
+
old_LIBS="$LIBS"
LIBS="$LIBS -ldl"
for ac_func in dladdr
Index: src/gdb/gdbserver/linux-amd64-ipa.c
===================================================================
--- src.orig/gdb/gdbserver/linux-amd64-ipa.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/linux-amd64-ipa.c 2010-06-29 21:42:05.000000000 +0100
@@ -75,6 +75,95 @@ gdb_agent_get_raw_reg (const unsigned ch
return *(ULONGEST *) (raw_regs + x86_64_ft_collect_regmap[regnum]);
}
+#ifdef HAVE_UST
+
+#include <ust/processor.h>
+
+/* "struct registers" is the UST object type holding the registers at
+ the time of the static tracepoint marker call. This doesn't
+ contain RIP, but we know what it must have been (the marker
+ address). */
+
+#define ST_REGENTRY(REG) \
+ { \
+ offsetof (struct registers, REG), \
+ sizeof (((struct registers *) NULL)->REG) \
+ }
+
+static struct
+{
+ int offset;
+ int size;
+} x86_64_st_collect_regmap[] =
+ {
+ ST_REGENTRY(rax),
+ ST_REGENTRY(rbx),
+ ST_REGENTRY(rcx),
+ ST_REGENTRY(rdx),
+ ST_REGENTRY(rsi),
+ ST_REGENTRY(rdi),
+ ST_REGENTRY(rbp),
+ ST_REGENTRY(rsp),
+ ST_REGENTRY(r8),
+ ST_REGENTRY(r9),
+ ST_REGENTRY(r10),
+ ST_REGENTRY(r11),
+ ST_REGENTRY(r12),
+ ST_REGENTRY(r13),
+ ST_REGENTRY(r14),
+ ST_REGENTRY(r15),
+ { -1, 0 },
+ ST_REGENTRY(rflags),
+ ST_REGENTRY(cs),
+ ST_REGENTRY(ss),
+ };
+
+#define X86_64_NUM_ST_COLLECT_GREGS \
+ (sizeof (x86_64_st_collect_regmap) / sizeof (x86_64_st_collect_regmap[0]))
+
+/* GDB's RIP register number. */
+#define AMD64_RIP_REGNUM 16
+
+void
+supply_static_tracepoint_registers (struct regcache *regcache,
+ const unsigned char *buf,
+ CORE_ADDR pc)
+{
+ int i;
+ unsigned long newpc = pc;
+
+ supply_register (regcache, AMD64_RIP_REGNUM, &newpc);
+
+ for (i = 0; i < X86_64_NUM_ST_COLLECT_GREGS; i++)
+ if (x86_64_st_collect_regmap[i].offset != -1)
+ {
+ switch (x86_64_st_collect_regmap[i].size)
+ {
+ case 8:
+ supply_register (regcache, i,
+ ((char *) buf)
+ + x86_64_st_collect_regmap[i].offset);
+ break;
+ case 2:
+ {
+ unsigned long reg
+ = * (short *) (((char *) buf)
+ + x86_64_st_collect_regmap[i].offset);
+ reg &= 0xffff;
+ supply_register (regcache, i, ®);
+ }
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "unhandled register size: %d",
+ x86_64_st_collect_regmap[i].size);
+ break;
+ }
+ }
+}
+
+#endif /* HAVE_UST */
+
/* This is only needed because reg-i386-linux-lib.o references it. We
may use it proper at some point. */
const char *gdbserver_xmltarget;
Index: src/gdb/gdbserver/linux-i386-ipa.c
===================================================================
--- src.orig/gdb/gdbserver/linux-i386-ipa.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/linux-i386-ipa.c 2010-06-29 21:42:05.000000000 +0100
@@ -110,6 +110,83 @@ gdb_agent_get_raw_reg (unsigned char *ra
return *(int *) (raw_regs + i386_ft_collect_regmap[regnum]);
}
+#ifdef HAVE_UST
+
+#include <ust/processor.h>
+
+/* "struct registers" is the UST object type holding the registers at
+ the time of the static tracepoint marker call. This doesn't
+ contain EIP, but we know what it must have been (the marker
+ address). */
+
+#define ST_REGENTRY(REG) \
+ { \
+ offsetof (struct registers, REG), \
+ sizeof (((struct registers *) NULL)->REG) \
+ }
+
+static struct
+{
+ int offset;
+ int size;
+} i386_st_collect_regmap[] =
+ {
+ ST_REGENTRY(eax),
+ ST_REGENTRY(ecx),
+ ST_REGENTRY(edx),
+ ST_REGENTRY(ebx),
+ ST_REGENTRY(esp),
+ ST_REGENTRY(ebp),
+ ST_REGENTRY(esi),
+ ST_REGENTRY(edi),
+ { -1, 0 }, /* eip */
+ ST_REGENTRY(eflags),
+ ST_REGENTRY(cs),
+ ST_REGENTRY(ss),
+ };
+
+#define i386_NUM_ST_COLLECT_GREGS \
+ (sizeof (i386_st_collect_regmap) / sizeof (i386_st_collect_regmap[0]))
+
+void
+supply_static_tracepoint_registers (struct regcache *regcache,
+ const unsigned char *buf,
+ CORE_ADDR pc)
+{
+ int i;
+ unsigned int newpc = pc;
+
+ supply_register (regcache, I386_EIP_REGNUM, &newpc);
+
+ for (i = 0; i < i386_NUM_ST_COLLECT_GREGS; i++)
+ if (i386_st_collect_regmap[i].offset != -1)
+ {
+ switch (i386_st_collect_regmap[i].size)
+ {
+ case 4:
+ supply_register (regcache, i,
+ ((char *) buf)
+ + i386_st_collect_regmap[i].offset);
+ break;
+ case 2:
+ {
+ unsigned long reg
+ = * (short *) (((char *) buf)
+ + i386_st_collect_regmap[i].offset);
+ reg &= 0xffff;
+ supply_register (regcache, i, ®);
+ }
+ break;
+ default:
+ internal_error ("unhandled register size: %d",
+ i386_st_collect_regmap[i].size);
+ }
+ }
+}
+
+#endif /* HAVE_UST */
+
+
/* This is only needed because reg-i386-linux-lib.o references it. We
may use it proper at some point. */
const char *gdbserver_xmltarget;
Index: src/gdb/gdbserver/server.c
===================================================================
--- src.orig/gdb/gdbserver/server.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/server.c 2010-06-29 21:42:05.000000000 +0100
@@ -1336,6 +1336,52 @@ handle_query (char *own_buf, int packet_
return;
}
+ if (strncmp ("qXfer:statictrace:read:", own_buf,
+ sizeof ("qXfer:statictrace:read:") -1) == 0)
+ {
+ unsigned char *data;
+ CORE_ADDR ofs;
+ unsigned int len;
+ char *annex;
+ ULONGEST nbytes;
+
+ require_running (own_buf);
+
+ if (current_traceframe == -1)
+ {
+ write_enn (own_buf);
+ return;
+ }
+
+ /* Reject any annex; grab the offset and length. */
+ if (decode_xfer_read (own_buf + sizeof ("qXfer:statictrace:read:") -1,
+ &annex, &ofs, &len) < 0
+ || annex[0] != '\0')
+ {
+ strcpy (own_buf, "E00");
+ return;
+ }
+
+ /* Read one extra byte, as an indicator of whether there is
+ more. */
+ if (len > PBUFSIZ - 2)
+ len = PBUFSIZ - 2;
+ data = malloc (len + 1);
+ if (!data)
+ return;
+
+ if (traceframe_read_sdata (current_traceframe, ofs,
+ data, len + 1, &nbytes))
+ write_enn (own_buf);
+ else if (nbytes > len)
+ *new_packet_len_p = write_qxfer_response (own_buf, data, len, 1);
+ else
+ *new_packet_len_p = write_qxfer_response (own_buf, data, nbytes, 0);
+
+ free (data);
+ return;
+ }
+
/* Protocol features query. */
if (strncmp ("qSupported", own_buf, 10) == 0
&& (own_buf[10] == ':' || own_buf[10] == '\0'))
@@ -1433,6 +1479,8 @@ handle_query (char *own_buf, int packet_
strcat (own_buf, ";DisconnectedTracing+");
if (gdb_supports_qRelocInsn && target_supports_fast_tracepoints ())
strcat (own_buf, ";FastTracepoints+");
+ strcat (own_buf, ";StaticTracepoints+");
+ strcat (own_buf, ";qXfer:statictrace:read+");
}
return;
Index: src/gdb/mi/mi-cmd-break.c
===================================================================
--- src.orig/gdb/mi/mi-cmd-break.c 2010-06-29 21:13:13.000000000 +0100
+++ src/gdb/mi/mi-cmd-break.c 2010-06-29 21:42:05.000000000 +0100
@@ -75,6 +75,7 @@ mi_cmd_break_insert (char *command, char
int enabled = 1;
int tracepoint = 0;
struct cleanup *back_to;
+ enum bptype type_wanted;
enum opt
{
@@ -151,9 +152,21 @@ mi_cmd_break_insert (char *command, char
back_to = make_cleanup_restore_integer (&mi_can_breakpoint_notify);
mi_can_breakpoint_notify = 1;
+
+ /* Note that to request a fast tracepoint, the client uses the
+ "hardware" flag, although there's nothing of hardware related to
+ fast tracepoints -- one can implement slow tracepoints with
+ hardware breakpoints, but fast tracepoints are always software.
+ "fast" is a misnomer, actually, "jump" would be more appropriate.
+ A simulator or an emulator could conceivably implement fast
+ regular non-jump based tracepoints. */
+ type_wanted = (tracepoint
+ ? (hardware ? bp_fast_tracepoint : bp_tracepoint)
+ : (hardware ? bp_hardware_breakpoint : bp_breakpoint));
+
create_breakpoint (get_current_arch (), address, condition, thread,
0 /* condition and thread are valid. */,
- temp_p, hardware, tracepoint,
+ temp_p, type_wanted,
ignore_count,
pending ? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE,
NULL, 0, enabled);
Index: src/gdb/remote.c
===================================================================
--- src.orig/gdb/remote.c 2010-06-29 21:13:13.000000000 +0100
+++ src/gdb/remote.c 2010-06-29 21:42:05.000000000 +0100
@@ -322,6 +322,9 @@ struct remote_state
/* True if the stub reports support for fast tracepoints. */
int fast_tracepoints;
+ /* True if the stub reports support for static tracepoints. */
+ int static_tracepoints;
+
/* True if the stub can continue running a trace while GDB is
disconnected. */
int disconnected_tracing;
@@ -1198,6 +1201,7 @@ enum {
PACKET_qXfer_spu_write,
PACKET_qXfer_osdata,
PACKET_qXfer_threads,
+ PACKET_qXfer_statictrace_read,
PACKET_qGetTIBAddr,
PACKET_qGetTLSAddr,
PACKET_qSupported,
@@ -1212,6 +1216,7 @@ enum {
PACKET_qAttached,
PACKET_ConditionalTracepoints,
PACKET_FastTracepoints,
+ PACKET_StaticTracepoints,
PACKET_bc,
PACKET_bs,
PACKET_TracepointSource,
@@ -2772,6 +2777,98 @@ remote_threads_extra_info (struct thread
}
+static int
+remote_static_tracepoint_marker_at (CORE_ADDR addr,
+ struct static_tracepoint_marker *marker)
+{
+ struct remote_state *rs = get_remote_state ();
+ char *p = rs->buf;
+
+ sprintf (p, "qTSTMat:");
+ p += strlen (p);
+ p += hexnumstr (p, addr);
+ putpkt (rs->buf);
+ getpkt (&rs->buf, &rs->buf_size, 0);
+ p = rs->buf;
+
+ if (*p == 'E')
+ error (_("Remote failure reply: %s"), p);
+
+ if (*p++ == 'm')
+ {
+ parse_static_tracepoint_marker_definition (p, &p, marker);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void
+free_current_marker (void *arg)
+{
+ struct static_tracepoint_marker **marker_p = arg;
+
+ if (*marker_p != NULL)
+ {
+ release_static_tracepoint_marker (*marker_p);
+ xfree (*marker_p);
+ }
+ else
+ *marker_p = NULL;
+}
+
+static VEC(static_tracepoint_marker_p) *
+remote_static_tracepoint_markers_by_strid (const char *strid)
+{
+ struct remote_state *rs = get_remote_state ();
+ VEC(static_tracepoint_marker_p) *markers = NULL;
+ struct static_tracepoint_marker *marker = NULL;
+ struct cleanup *old_chain;
+ char *p;
+
+ /* Ask for a first packet of static tracepoint marker
+ definition. */
+ putpkt ("qTfSTM");
+ getpkt (&rs->buf, &rs->buf_size, 0);
+ p = rs->buf;
+ if (*p == 'E')
+ error (_("Remote failure reply: %s"), p);
+
+ old_chain = make_cleanup (free_current_marker, &marker);
+
+ while (*p++ == 'm')
+ {
+ if (marker == NULL)
+ marker = XCNEW (struct static_tracepoint_marker);
+
+ do
+ {
+ parse_static_tracepoint_marker_definition (p, &p, marker);
+
+ if (strid == NULL || strcmp (strid, marker->str_id) == 0)
+ {
+ VEC_safe_push (static_tracepoint_marker_p,
+ markers, marker);
+ marker = NULL;
+ }
+ else
+ {
+ release_static_tracepoint_marker (marker);
+ memset (marker, 0, sizeof (*marker));
+ }
+ }
+ while (*p++ == ','); /* comma-separated list */
+ /* Ask for another packet of static tracepoint definition. */
+ putpkt ("qTsSTM");
+ getpkt (&rs->buf, &rs->buf_size, 0);
+ p = rs->buf;
+ }
+
+ do_cleanups (old_chain);
+ return markers;
+}
+
+
/* Implement the to_get_ada_task_ptid function for the remote targets. */
static ptid_t
@@ -3552,6 +3649,16 @@ remote_fast_tracepoint_feature (const st
}
static void
+remote_static_tracepoint_feature (const struct protocol_feature *feature,
+ enum packet_support support,
+ const char *value)
+{
+ struct remote_state *rs = get_remote_state ();
+
+ rs->static_tracepoints = (support == PACKET_ENABLE);
+}
+
+static void
remote_disconnected_tracing_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
@@ -3593,6 +3700,8 @@ static struct protocol_feature remote_pr
PACKET_ConditionalTracepoints },
{ "FastTracepoints", PACKET_DISABLE, remote_fast_tracepoint_feature,
PACKET_FastTracepoints },
+ { "StaticTracepoints", PACKET_DISABLE, remote_static_tracepoint_feature,
+ PACKET_StaticTracepoints },
{ "DisconnectedTracing", PACKET_DISABLE, remote_disconnected_tracing_feature,
-1 },
{ "ReverseContinue", PACKET_DISABLE, remote_supported_packet,
@@ -8046,6 +8155,16 @@ remote_xfer_partial (struct target_ops *
[PACKET_qXfer_siginfo_write]);
}
+ if (object == TARGET_OBJECT_STATIC_TRACE_DATA)
+ {
+ if (readbuf)
+ return remote_read_qxfer (ops, "statictrace", annex, readbuf, offset, len,
+ &remote_protocol_packets
+ [PACKET_qXfer_statictrace_read]);
+ else
+ return -1;
+ }
+
/* Only handle flash writes. */
if (writebuf != NULL)
{
@@ -9478,6 +9597,14 @@ remote_supports_fast_tracepoints (void)
return rs->fast_tracepoints;
}
+static int
+remote_supports_static_tracepoints (void)
+{
+ struct remote_state *rs = get_remote_state ();
+
+ return rs->static_tracepoints;
+}
+
static void
remote_trace_init (void)
{
@@ -9606,6 +9733,25 @@ remote_download_tracepoint (struct break
give up on the trace run. */
warning (_("Target does not support fast tracepoints, downloading %d as regular tracepoint"), t->number);
}
+ else if (t->type == bp_static_tracepoint)
+ {
+ /* Only test for support at download time; we may not know
+ target capabilities at definition time. */
+ if (remote_supports_static_tracepoints ())
+ {
+ struct static_tracepoint_marker marker;
+
+ if (target_static_tracepoint_marker_at (tpaddr, &marker))
+ strcat (buf, ":S");
+ else
+ error ("Static tracepoint not valid during download");
+ }
+ else
+ /* Fast tracepoints are functionally identical to regular
+ tracepoints, so don't take lack of support as a reason
+ to give up on the trace run. */
+ error (_("Target does not support static tracepoints"));
+ }
/* If the tracepoint has a conditional, make it into an agent
expression and append to the definition. */
if (loc->cond)
@@ -10101,6 +10247,10 @@ Specify the serial device it is connecte
remote_ops.to_verify_memory = remote_verify_memory;
remote_ops.to_get_tib_address = remote_get_tib_address;
remote_ops.to_set_permissions = remote_set_permissions;
+ remote_ops.to_static_tracepoint_marker_at
+ = remote_static_tracepoint_marker_at;
+ remote_ops.to_static_tracepoint_markers_by_strid
+ = remote_static_tracepoint_markers_by_strid;
}
/* Set up the extended remote vector by making a copy of the standard
@@ -10579,6 +10729,12 @@ Show the maximum size of the address (in
add_packet_config_cmd (&remote_protocol_packets[PACKET_QAllow],
"QAllow", "allow", 0);
+ add_packet_config_cmd (&remote_protocol_packets[PACKET_StaticTracepoints],
+ "StaticTracepoints", "static-tracepoints", 0);
+
+ add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_statictrace_read],
+ "qXfer:statictrace:read", "read-sdata-object", 0);
+
/* Keep the old ``set remote Z-packet ...'' working. Each individual
Z sub-packet has its own set and show commands, but users may
have sets to this variable in their .gdbinit files (or in their
Index: src/gdb/target.c
===================================================================
--- src.orig/gdb/target.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/target.c 2010-06-29 21:42:05.000000000 +0100
@@ -679,6 +679,8 @@ update_current_target (void)
INHERIT (to_set_circular_trace_buffer, t);
INHERIT (to_get_tib_address, t);
INHERIT (to_set_permissions, t);
+ INHERIT (to_static_tracepoint_marker_at, t);
+ INHERIT (to_static_tracepoint_markers_by_strid, t);
INHERIT (to_magic, t);
/* Do not inherit to_memory_map. */
/* Do not inherit to_flash_erase. */
@@ -878,6 +880,12 @@ update_current_target (void)
de_fault (to_set_permissions,
(void (*) (void))
target_ignore);
+ de_fault (to_static_tracepoint_marker_at,
+ (int (*) (CORE_ADDR, struct static_tracepoint_marker *))
+ return_zero);
+ de_fault (to_static_tracepoint_markers_by_strid,
+ (VEC(static_tracepoint_marker_p) * (*) (const char *))
+ tcomplain);
#undef de_fault
/* Finally, position the target-stack beneath the squashed
Index: src/gdb/target.h
===================================================================
--- src.orig/gdb/target.h 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/target.h 2010-06-29 21:42:05.000000000 +0100
@@ -35,6 +35,7 @@ struct trace_state_variable;
struct trace_status;
struct uploaded_tsv;
struct uploaded_tp;
+struct static_tracepoint_marker;
/* This include file defines the interface between the main part
of the debugger, and the part which is target-specific, or
@@ -261,6 +262,8 @@ enum target_object
TARGET_OBJECT_SIGNAL_INFO,
/* The list of threads that are being debugged. */
TARGET_OBJECT_THREADS,
+ /* Collected static trace data. */
+ TARGET_OBJECT_STATIC_TRACE_DATA,
/* Possible future objects: TARGET_OBJECT_FILE, ... */
};
@@ -276,6 +279,9 @@ enum trace_find_type
tfind_outside,
};
+typedef struct static_tracepoint_marker *static_tracepoint_marker_p;
+DEF_VEC_P(static_tracepoint_marker_p);
+
/* Request that OPS transfer up to LEN 8-bit bytes of the target's
OBJECT. The OFFSET, for a seekable object, specifies the
starting point. The ANNEX can be used to provide additional
@@ -689,6 +695,16 @@ struct target_ops
/* Send the new settings of write permission variables. */
void (*to_set_permissions) (void);
+ /* Look for a static tracepoint marker at ADDR, and fill in MARKER
+ with its details. Return 1 on success, 0 on failure. */
+ int (*to_static_tracepoint_marker_at) (CORE_ADDR,
+ struct static_tracepoint_marker *marker);
+
+ /* Return a vector of all tracepoints markers string id ID, or all
+ markers if ID is NULL. */
+ VEC(static_tracepoint_marker_p) *(*to_static_tracepoint_markers_by_strid)
+ (const char *id);
+
int to_magic;
/* Need sub-structure for target machine related rather than comm related?
*/
@@ -1384,6 +1400,12 @@ extern int target_search_memory (CORE_AD
#define target_set_permissions() \
(*current_target.to_set_permissions) ()
+#define target_static_tracepoint_marker_at(addr, marker) \
+ (*current_target.to_static_tracepoint_marker_at) (addr, marker)
+
+#define target_static_tracepoint_markers_by_strid(marker_id) \
+ (*current_target.to_static_tracepoint_markers_by_strid) (marker_id)
+
/* Command logging facility. */
#define target_log_command(p) \
Index: src/gdb/tracepoint.c
===================================================================
--- src.orig/gdb/tracepoint.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/tracepoint.c 2010-06-29 21:42:05.000000000 +0100
@@ -47,7 +47,7 @@
#include "stack.h"
#include "gdbcore.h"
#include "remote.h"
-
+#include "source.h"
#include "ax.h"
#include "ax-gdb.h"
@@ -622,9 +622,10 @@ validate_actionline (char **line, struct
if (*p == '$') /* look for special pseudo-symbols */
{
- if ((0 == strncasecmp ("reg", p + 1, 3)) ||
- (0 == strncasecmp ("arg", p + 1, 3)) ||
- (0 == strncasecmp ("loc", p + 1, 3)))
+ if (0 == strncasecmp ("reg", p + 1, 3)
+ || 0 == strncasecmp ("arg", p + 1, 3)
+ || 0 == strncasecmp ("loc", p + 1, 3)
+ || 0 == strncasecmp ("_sdata", p + 1, 6))
{
p = strchr (p, ',');
continue;
@@ -747,6 +748,9 @@ struct collection_list
long next_aexpr_elt;
struct agent_expr **aexpr_list;
+ /* True is the user requested a collection of "$_sdata", "static
+ tracepoint data". */
+ int strace_data;
}
tracepoint_list, stepping_list;
@@ -1086,6 +1090,14 @@ add_local_symbols (struct collection_lis
}
}
+static void
+add_static_trace_data (struct collection_list *collection)
+{
+ if (info_verbose)
+ printf_filtered ("collect static trace data\n");
+ collection->strace_data = 1;
+}
+
/* worker function */
static void
clear_collection_list (struct collection_list *list)
@@ -1100,6 +1112,7 @@ clear_collection_list (struct collection
}
list->next_aexpr_elt = 0;
memset (list->regs_mask, 0, sizeof (list->regs_mask));
+ list->strace_data = 0;
}
/* reduce a collection list to string form (for gdb protocol) */
@@ -1114,9 +1127,19 @@ stringify_collection_list (struct collec
char *end;
long i;
- count = 1 + list->next_memrange + list->next_aexpr_elt + 1;
+ count = 1 + 1 + list->next_memrange + list->next_aexpr_elt + 1;
str_list = (char *(*)[]) xmalloc (count * sizeof (char *));
+ if (list->strace_data)
+ {
+ if (info_verbose)
+ printf_filtered ("\nCollecting static trace data\n");
+ end = temp_buf;
+ *end++ = 'L';
+ (*str_list)[ndx] = savestring (temp_buf, end - temp_buf);
+ ndx++;
+ }
+
for (i = sizeof (list->regs_mask) - 1; i > 0; i--)
if (list->regs_mask[i] != 0) /* skip leading zeroes in regs_mask */
break;
@@ -1276,6 +1299,11 @@ encode_actions_1 (struct command_line *a
'L');
action_exp = strchr (action_exp, ','); /* more? */
}
+ else if (0 == strncasecmp ("$_sdata", action_exp, 7))
+ {
+ add_static_trace_data (collect);
+ action_exp = strchr (action_exp, ','); /* more? */
+ }
else
{
unsigned long addr, len;
@@ -3476,6 +3504,11 @@ parse_tracepoint_definition (char *line,
p++;
p = unpack_varlen_hex (p, &orig_size);
}
+ else if (*p == 'S')
+ {
+ type = bp_static_tracepoint;
+ p++;
+ }
else if (*p == 'X')
{
p++;
@@ -4075,12 +4108,266 @@ init_tfile_ops (void)
tfile_ops.to_magic = OPS_MAGIC;
}
+/* Given a line of text defining a static tracepoint marker, parse it
+ into a "static tracepoint marker" object. Throws an error is
+ parsing fails. If PP is non-null, it points to one past the end of
+ the parsed marker definition. */
+
+void
+parse_static_tracepoint_marker_definition (char *line, char **pp,
+ struct static_tracepoint_marker *marker)
+{
+ char *p, *endp;
+ ULONGEST addr;
+ int end;
+
+ p = line;
+ p = unpack_varlen_hex (p, &addr);
+ p++; /* skip a colon */
+
+ marker->gdbarch = target_gdbarch;
+ marker->address = (CORE_ADDR) addr;
+
+ endp = strchr (p, ':');
+ if (endp == NULL)
+ error ("bad marker definition: %s", line);
+
+ marker->str_id = xmalloc (endp - p + 1);
+ end = hex2bin (p, (gdb_byte *) marker->str_id, (endp - p + 1) / 2);
+ marker->str_id[end] = '\0';
+
+ p += 2 * end;
+ p++; /* skip a colon */
+
+ marker->extra = xmalloc (strlen (p) + 1);
+ end = hex2bin (p, (gdb_byte *) marker->extra, strlen (p) / 2);
+ marker->extra[end] = '\0';
+
+ if (pp)
+ *pp = p;
+}
+
+/* Release a static tracepoint marker's contents. Note that the
+ object itself isn't released here. There objects are usually on
+ the stack. */
+
+void
+release_static_tracepoint_marker (struct static_tracepoint_marker *marker)
+{
+ xfree (marker->str_id);
+ marker->str_id = NULL;
+}
+
+/* Print MARKER to gdb_stdout. */
+
+static void
+print_one_static_tracepoint_marker (int count,
+ struct static_tracepoint_marker *marker)
+{
+ struct command_line *l;
+ struct symbol *sym;
+
+ char wrap_indent[80];
+ char extra_field_indent[80];
+ struct ui_stream *stb = ui_out_stream_new (uiout);
+ struct cleanup *old_chain = make_cleanup_ui_out_stream_delete (stb);
+ struct cleanup *bkpt_chain;
+ VEC(breakpoint_p) *tracepoints;
+
+ struct symtab_and_line sal;
+
+ init_sal (&sal);
+
+ sal.pc = marker->address;
+
+ tracepoints = static_tracepoints_here (marker->address);
+
+ bkpt_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "marker");
+
+ /* A counter field to help readability. This is not a stable
+ identifier! */
+ ui_out_field_int (uiout, "count", count);
+
+ ui_out_field_string (uiout, "marker-id", marker->str_id);
+
+ ui_out_field_fmt (uiout, "enabled", "%c",
+ !VEC_empty (breakpoint_p, tracepoints) ? 'y' : 'n');
+ ui_out_spaces (uiout, 2);
+
+ strcpy (wrap_indent, " ");
+
+ if (gdbarch_addr_bit (marker->gdbarch) <= 32)
+ strcat (wrap_indent, " ");
+ else
+ strcat (wrap_indent, " ");
+
+ strcpy (extra_field_indent, " ");
+
+ ui_out_field_core_addr (uiout, "addr", marker->gdbarch, marker->address);
+
+ sal = find_pc_line (marker->address, 0);
+ sym = find_pc_sect_function (marker->address, NULL);
+ if (sym)
+ {
+ ui_out_text (uiout, "in ");
+ ui_out_field_string (uiout, "func",
+ SYMBOL_PRINT_NAME (sym));
+ ui_out_wrap_hint (uiout, wrap_indent);
+ ui_out_text (uiout, " at ");
+ }
+ else
+ ui_out_field_skip (uiout, "func");
+
+ if (sal.symtab != NULL)
+ {
+ ui_out_field_string (uiout, "file", sal.symtab->filename);
+ ui_out_text (uiout, ":");
+
+ if (ui_out_is_mi_like_p (uiout))
+ {
+ char *fullname = symtab_to_fullname (sal.symtab);
+
+ if (fullname)
+ ui_out_field_string (uiout, "fullname", fullname);
+ }
+ else
+ ui_out_field_skip (uiout, "fullname");
+
+ ui_out_field_int (uiout, "line", sal.line);
+ }
+ else
+ {
+ ui_out_field_skip (uiout, "fullname");
+ ui_out_field_skip (uiout, "line");
+ }
+
+ ui_out_text (uiout, "\n");
+ ui_out_text (uiout, extra_field_indent);
+ ui_out_text (uiout, _("Data: \""));
+ ui_out_field_string (uiout, "extra-data", marker->extra);
+ ui_out_text (uiout, "\"\n");
+
+ if (!VEC_empty (breakpoint_p, tracepoints))
+ {
+ struct cleanup *cleanup_chain;
+ int ix;
+ struct breakpoint *b;
+
+ cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout,
+ "tracepoints-at");
+
+ ui_out_text (uiout, extra_field_indent);
+ ui_out_text (uiout, _("Probed by static tracepoints: "));
+ for (ix = 0; VEC_iterate(breakpoint_p, tracepoints, ix, b); ix++)
+ {
+ if (ix > 0)
+ ui_out_text (uiout, ", ");
+ ui_out_text (uiout, "#");
+ ui_out_field_int (uiout, "tracepoint-id", b->number);
+ }
+
+ do_cleanups (cleanup_chain);
+
+ if (ui_out_is_mi_like_p (uiout))
+ ui_out_field_int (uiout, "number-of-tracepoints",
+ VEC_length(breakpoint_p, tracepoints));
+ else
+ ui_out_text (uiout, "\n");
+ }
+ VEC_free (breakpoint_p, tracepoints);
+
+ do_cleanups (bkpt_chain);
+ do_cleanups (old_chain);
+}
+
+static void
+info_static_tracepoint_markers_command (char *arg, int from_tty)
+{
+ VEC(static_tracepoint_marker_p) *markers;
+ struct cleanup *old_chain;
+ struct static_tracepoint_marker *marker;
+ int i;
+
+ old_chain
+ = make_cleanup_ui_out_table_begin_end (uiout, 5, -1,
+ "StaticTracepointMarkersTable");
+
+ ui_out_table_header (uiout, 7, ui_left, "counter", "Cnt");
+
+ ui_out_table_header (uiout, 40, ui_left, "marker-id", "ID");
+
+ ui_out_table_header (uiout, 3, ui_left, "enabled", "Enb");
+ if (gdbarch_addr_bit (target_gdbarch) <= 32)
+ ui_out_table_header (uiout, 10, ui_left, "addr", "Address");
+ else
+ ui_out_table_header (uiout, 18, ui_left, "addr", "Address");
+ ui_out_table_header (uiout, 40, ui_noalign, "what", "What");
+
+ ui_out_table_body (uiout);
+
+ markers = target_static_tracepoint_markers_by_strid (NULL);
+ make_cleanup (VEC_cleanup (static_tracepoint_marker_p), &markers);
+
+ for (i = 0;
+ VEC_iterate (static_tracepoint_marker_p,
+ markers, i, marker);
+ i++)
+ {
+ print_one_static_tracepoint_marker (i + 1, marker);
+ release_static_tracepoint_marker (marker);
+ }
+
+ do_cleanups (old_chain);
+}
+
+/* The $_sdata convenience variable is a bit special. We don't know
+ for sure type of the value until we actually have a chance to fetch
+ the data --- the size of the object depends on what has been
+ collected. We solve this by making $_sdata be an internalvar that
+ creates a new value on access. */
+
+/* Return a new value with the correct type for the sdata object of
+ the current trace frame. Return a void value if there's no object
+ available. */
+
+static struct value *
+sdata_make_value (struct gdbarch *gdbarch, struct internalvar *var)
+{
+ LONGEST size;
+ gdb_byte *buf;
+
+ /* We need to read the whole object before we know its size. */
+ size = target_read_alloc (¤t_target,
+ TARGET_OBJECT_STATIC_TRACE_DATA,
+ NULL, &buf);
+ if (size >= 0)
+ {
+ struct value *v;
+ struct type *type;
+
+ type = init_vector_type (builtin_type (gdbarch)->builtin_true_char,
+ size);
+ v = allocate_value (type);
+ memcpy (value_contents_raw (v), buf, size);
+ xfree (buf);
+ return v;
+ }
+ else
+ return allocate_value (builtin_type (gdbarch)->builtin_void);
+}
+
/* module initialization */
void
_initialize_tracepoint (void)
{
struct cmd_list_element *c;
+ /* Explicitly create without lookup, since that tries to create a
+ value with a void typed value, and when we get here, gdbarch
+ isn't initialized yet. At this point, we're quite sure there
+ isn't another convenience variable of the same name. */
+ create_internalvar_type_lazy ("_sdata", sdata_make_value);
+
traceframe_number = -1;
tracepoint_number = -1;
@@ -4143,6 +4430,11 @@ If no arguments are supplied, delete all
Status of trace state variables and their values.\n\
"));
+ add_info ("static-tracepoint-markers",
+ info_static_tracepoint_markers_command, _("\
+List target static tracepoints markers.\n\
+"));
+
add_prefix_cmd ("tfind", class_trace, trace_find_command, _("\
Select a trace frame;\n\
No argument means forward by one frame; '-' means backward by one frame."),
@@ -4223,6 +4515,7 @@ Also accepts the following special argum
$regs -- all registers.\n\
$args -- all function arguments.\n\
$locals -- all variables local to the block/function scope.\n\
+ $_sdata -- static tracepoint data (ignored for non-static tracepoints).\n\
Note: this command can only be used in a tracepoint \"actions\" list."));
add_com ("teval", class_trace, teval_pseudocommand, _("\
Index: src/gdb/tracepoint.h
===================================================================
--- src.orig/gdb/tracepoint.h 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/tracepoint.h 2010-06-29 21:42:05.000000000 +0100
@@ -166,6 +166,25 @@ struct uploaded_tsv
struct uploaded_tsv *next;
};
+/* Struct recording info about a target static tracepoint marker. */
+
+struct static_tracepoint_marker
+{
+ struct gdbarch *gdbarch;
+ CORE_ADDR address;
+
+ /* The string ID of the marker. */
+ char *str_id;
+
+ /* Extra target reported info associated with the marker. */
+ char *extra;
+};
+
+extern void parse_static_tracepoint_marker_definition
+ (char *line, char **pp,
+ struct static_tracepoint_marker *marker);
+extern void release_static_tracepoint_marker (struct static_tracepoint_marker *);
+
/* A hook used to notify the UI of tracepoint operations. */
extern void (*deprecated_trace_find_hook) (char *arg, int from_tty);
Index: src/gdb/gdbserver/server.h
===================================================================
--- src.orig/gdb/gdbserver/server.h 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/server.h 2010-06-29 21:42:05.000000000 +0100
@@ -542,6 +542,10 @@ int fetch_traceframe_registers (int tfnu
struct regcache *regcache,
int regnum);
+int traceframe_read_sdata (int tfnum, ULONGEST offset,
+ unsigned char *buf, ULONGEST length,
+ ULONGEST *nbytes);
+
/* If a thread is determined to be collecting a fast tracepoint, this
structure holds the collect status. */
@@ -569,6 +573,9 @@ int handle_tracepoint_bkpts (struct thre
void initialize_low_tracepoint (void);
void supply_fast_tracepoint_registers (struct regcache *regcache,
const unsigned char *regs);
+void supply_static_tracepoint_registers (struct regcache *regcache,
+ const unsigned char *regs,
+ CORE_ADDR pc);
#else
void stop_tracing (void);
#endif
Index: src/gdb/python/py-breakpoint.c
===================================================================
--- src.orig/gdb/python/py-breakpoint.c 2010-06-29 21:13:13.000000000 +0100
+++ src/gdb/python/py-breakpoint.c 2010-06-29 21:42:05.000000000 +0100
@@ -592,7 +592,7 @@ bppy_new (PyTypeObject *subtype, PyObjec
create_breakpoint (python_gdbarch,
spec, NULL, -1,
0,
- 0, 0, 0,
+ 0, bp_breakpoint,
0,
AUTO_BOOLEAN_TRUE,
NULL, 0, 1);
Index: src/gdb/gdbserver/Makefile.in
===================================================================
--- src.orig/gdb/gdbserver/Makefile.in 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/Makefile.in 2010-06-29 21:42:05.000000000 +0100
@@ -70,6 +70,10 @@ CC-LD=${CC}
INCLUDE_DIR = ${srcdir}/../../include
INCLUDE_DEP = $$(INCLUDE_DIR)
+# Where is ust? These will be empty if ust was not available.
+ustlibs = @ustlibs@
+ustinc = @ustinc@
+
# All the includes used for CFLAGS and for lint.
# -I. for config files.
# -I${srcdir} for our headers.
@@ -193,14 +197,14 @@ gdbreplay$(EXEEXT): $(GDBREPLAY_OBS)
${CC-LD} $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) -o gdbreplay$(EXEEXT) $(GDBREPLAY_OBS) \
$(XM_CLIBS)
-IPA_OBJS=tracepoint-ipa.o utils-ipa.o regcache-ipa.o ${IPA_DEPFILES}
+IPA_OBJS=tracepoint-ipa.o utils-ipa.o regcache-ipa.o remote-utils-ipa.o ${IPA_DEPFILES}
IPA_LIB=libinproctrace.so
$(IPA_LIB): $(IPA_OBJS) ${ADD_DEPS} ${CDEPS}
rm -f $(IPA_LIB)
${CC-LD} -shared -fPIC -Wl,--no-undefined $(INTERNAL_CFLAGS) \
- $(INTERNAL_LDFLAGS) -o $(IPA_LIB) ${IPA_OBJS}
+ $(INTERNAL_LDFLAGS) -o $(IPA_LIB) ${IPA_OBJS} -ldl -pthread
# Put the proper machine-specific files first, so M-. on a machine
# specific routine gets the one for the correct machine.
@@ -295,9 +299,11 @@ linux_low_h = $(srcdir)/linux-low.h
nto_low_h = $(srcdir)/nto-low.h
+UST_CFLAGS = $(ustinc) -DCONFIG_UST_GDB_INTEGRATION
+
# Note, we only build the IPA if -fvisibility=hidden is supported in
# the first place.
-IPAGENT_CFLAGS = $(CPPFLAGS) $(INTERNAL_CFLAGS) \
+IPAGENT_CFLAGS = $(CPPFLAGS) $(INTERNAL_CFLAGS) $(UST_CFLAGS) \
-fPIC -DGDBSERVER -DIN_PROCESS_AGENT \
-fvisibility=hidden
Index: src/gdb/gdbserver/remote-utils.c
===================================================================
--- src.orig/gdb/gdbserver/remote-utils.c 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/gdbserver/remote-utils.c 2010-06-29 21:42:05.000000000 +0100
@@ -74,6 +74,8 @@
typedef int socklen_t;
#endif
+#ifndef IN_PROCESS_AGENT
+
#if USE_WIN32API
# define INVALID_DESCRIPTOR INVALID_SOCKET
#else
@@ -371,6 +373,8 @@ fromhex (int a)
return 0;
}
+#endif
+
static const char hexchars[] = "0123456789abcdef";
static int
@@ -394,6 +398,8 @@ ishex (int ch, int *val)
return 0;
}
+#ifndef IN_PROCESS_AGENT
+
int
unhexify (char *bin, const char *hex, int count)
{
@@ -446,6 +452,8 @@ decode_address_to_semicolon (CORE_ADDR *
return end;
}
+#endif
+
/* Convert number NIB to a hex digit. */
static int
@@ -457,6 +465,8 @@ tohex (int nib)
return 'a' + nib - 10;
}
+#ifndef IN_PROCESS_AGENT
+
int
hexify (char *hex, const char *bin, int count)
{
@@ -600,6 +610,8 @@ try_rle (char *buf, int remaining, unsig
return n + 1;
}
+#endif
+
char *
unpack_varlen_hex (char *buff, /* packet to parse */
ULONGEST *result)
@@ -617,6 +629,8 @@ unpack_varlen_hex (char *buff, /* packet
return buff;
}
+#ifndef IN_PROCESS_AGENT
+
/* Write a PTID to BUF. Returns BUF+CHARACTERS_WRITTEN. */
char *
@@ -1126,6 +1140,8 @@ write_enn (char *buf)
buf[3] = '\0';
}
+#endif
+
void
convert_int_to_ascii (const unsigned char *from, char *to, int n)
{
@@ -1142,6 +1158,7 @@ convert_int_to_ascii (const unsigned cha
*to++ = 0;
}
+#ifndef IN_PROCESS_AGENT
void
convert_ascii_to_int (const char *from, unsigned char *to, int n)
@@ -1841,3 +1858,5 @@ buffer_xml_printf (struct buffer *buffer
buffer_grow_str (buffer, prev);
va_end (ap);
}
+
+#endif
Index: src/gdb/NEWS
===================================================================
--- src.orig/gdb/NEWS 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/NEWS 2010-06-29 21:42:05.000000000 +0100
@@ -12,6 +12,27 @@
thread-specific pointer to the TIB. This feature is also supported
when remote debugging using GDBserver.
+* Static tracepoints
+
+ Static tracepoints are calls in the user program into a tracing
+ library. One such library is a port of the LTTng kernel tracer to
+ userspace --- UST (LTTng Userspace Tracer, http://lttng.org/ust).
+ When debugging with GDBserver, GDB now supports combining the GDB
+ tracepoint machinery with such libraries. For example: the user can
+ use GDB to probe a static tracepoint marker (a call from the user
+ program into the tracing library) with the new "strace" command (see
+ "New commands" below). This creates a "static tracepoint" in the
+ breakpoint list, that can be manipulated with the same feature set
+ as fast and regular tracepoints. E.g., collect registers, local and
+ global variables, collect trace state variables, and define
+ tracepoint conditions. In addition, the user can collect extra
+ static tracepoint marker specific data, by collecting the new
+ $_sdata internal variable. When analying the trace buffer, you can
+ inspect $_sdata like any other variable available to GDB. For more
+ information, see the "Tracepoints" chapter in GDB user manual. New
+ remote packets have been defined to support static tracepoints, see
+ the "New remote packets" section below.
+
* New remote packets
qGetTIBAddr
@@ -27,23 +48,42 @@ qRelocInsn
is particularly useful for stubs that support fast tracepoints. GDB
reports support for this feature in the qSupported packet.
+qTfSTM, qTsSTM
+
+ List static tracepoint markers in the target program.
+
+qTSTMat
+
+ List static tracepoint markers at a given address in the target
+ program.
+
+qXfer:statictrace:read
+
+ Read the static trace data collected (by a `collect $_sdata'
+ tracepoint action). The remote stub reports support for this packet
+ to gdb's qSupported query.
+
* The source command now accepts a -s option to force searching for the
script in the source search path even if the script name specifies
a directory.
* New features in the GDB remote stub, GDBserver
- - GDBserver now support tracepoints (including fast tracepoints).
- The feature is currently supported by the i386-linux and
- amd64-linux builds. See the "Tracepoints support in gdbserver"
- section in the manual for more information. GDBserver JIT
- compiles the tracepoint's conditional agent expression bytecode
- into native code whenever possible for low overhead dynamic
- tracepoints conditionals. For such tracepoints, an expression
- that examines program state is evaluated when the tracepoint is
- reached, in order to determine whether to capture trace data. If
- the condition is simple and false, processing the tracepoint
- finishes very quickly and no data is gathered.
+ - GDBserver now support tracepoints (including fast tracepoints, and
+ static tracepoints). The feature is currently supported by the
+ i386-linux and amd64-linux builds. See the "Tracepoints support
+ in gdbserver" section in the manual for more information.
+
+ GDBserver JIT compiles the tracepoint's conditional agent
+ expression bytecode into native code whenever possible for low
+ overhead dynamic tracepoints conditionals. For such tracepoints,
+ an expression that examines program state is evaluated when the
+ tracepoint is reached, in order to determine whether to capture
+ trace data. If the condition is simple and false, processing the
+ tracepoint finishes very quickly and no data is gathered.
+
+ GDBserver interfaces with the UST (LTTng Userspace Tracer) library
+ for static tracepoints support.
- GDBserver now supports x86_64 Windows 64-bit debugging.
@@ -97,6 +137,13 @@ save breakpoints <filename>
`save tracepoints' is a new alias for `save-tracepoints'. The latter
is now deprecated.
+info static-tracepoint-markers
+ Display information about static tracepoint markers in the target.
+
+strace FN | FILE:LINE | *ADDR | -m MARKER_ID
+ Define a static tracepoint by probing a marker at the given
+ function, line, address, or marker ID.
+
* Python scripting
** The GDB Python API now has access to breakpoints, symbols, symbol
Index: src/gdb/doc/gdb.texinfo
===================================================================
--- src.orig/gdb/doc/gdb.texinfo 2010-06-29 21:13:14.000000000 +0100
+++ src/gdb/doc/gdb.texinfo 2010-06-29 21:42:05.000000000 +0100
@@ -8279,6 +8279,13 @@ to match the format in which the data wa
The variable @code{$_exitcode} is automatically set to the exit code when
the program being debugged terminates.
+@item $_sdata
+@vindex $_sdata@r{, inspect, convenience variable}
+The variable @code{$_sdata} contains extra collected static tracepoint
+data. @xref{Tracepoint Actions,,Tracepoint Action Lists}. Note that
+@code{$_sdata} could be empty, if not inspecting a trace buffer, or
+if extra static tracepoint data has not been collected.
+
@item $_siginfo
@vindex $_siginfo@r{, convenience variable}
The variable @code{$_siginfo} contains extra signal information
@@ -9590,6 +9597,27 @@ Some targets may support @dfn{fast trace
a different way (such as with a jump instead of a trap), that is
faster but possibly restricted in where they may be installed.
+@cindex static tracepoints
+@cindex markers, static tracepoints
+@cindex probing markers, static tracepoints
+Regular and fast tracepoints are dynamic tracing facilities, meaning
+that they can be used to insert tracepoints at (almost) any location
+in the target. Some targets may also support controlling @dfn{static
+tracepoints} from @value{GDBN}. With static tracing, a set of
+instrumentation points, also known as @dfn{markers}, are embedded in
+the target program, and can be activated or deactivated by name or
+address. These are usually placed at locations which facilitate
+investigating what the target is actually doing. @value{GDBN}'s
+support for static tracing includes being able to list instrumentation
+points, and attach them with @value{GDBN} defined high level
+tracepoints that expose the whole range of convenience of
+@value{GDBN}'s tracepoints support. Namelly, support for collecting
+registers values and values of global or local (to the instrumentation
+point) variables; tracepoint conditions and trace state variables.
+The act of installing a @value{GDBN} static tracepoint on an
+instrumentation point, or marker, is referred to as @dfn{probing} a
+static tracepoint marker.
+
@code{gdbserver} supports tracepoints on some target systems.
@xref{Server,,Tracepoints support in @code{gdbserver}}.
@@ -9604,6 +9632,7 @@ conditions and actions.
* Trace State Variables::
* Tracepoint Actions::
* Listing Tracepoints::
+* Listing Static Tracepoint Markers::
* Starting and Stopping Trace Experiments::
* Tracepoint Restrictions::
@end menu
@@ -9663,6 +9692,65 @@ message.
@value{GDBN} handles arguments to @code{ftrace} exactly as for
@code{trace}.
+@item strace @var{location} [ if @var{cond} ]
+@cindex static tracepoint, setting
+@kindex strace
+The @code{strace} command sets a static tracepoint. For targets that
+support it, setting a static tracepoint probes a static
+instrumentation point, or marker, found at @var{location}. It may not
+be possible to set a static tracepoint at the desired location, in
+which case the command will exit with an explanatory message.
+
+@value{GDBN} handles arguments to @code{strace} exactly as for
+@code{trace}, with the addition that the user can also specify
+@code{-m @var{marker}} as @var{location}. This probes the marker
+identified by the @var{marker} string identifier. This identifier
+depends on the static tracepoint backend library your program is
+using. You can find all the marker identifiers in the @samp{ID} field
+of the @code{info static-tracepoint-markers} command output.
+@xref{Listing Static Tracepoint Markers,,Listing Static Tracepoint
+Markers}. For example, in the following small program using the UST
+tracing engine:
+
+@smallexample
+main ()
+@{
+ trace_mark(ust, bar33, "str %s", "FOOBAZ");
+@}
+@end smallexample
+
+@noindent
+the marker id is composed of joining the first two arguments to the
+@code{trace_mark} call with a slash, which translates to:
+
+@smallexample
+(@value{GDBP}) info static-tracepoint-markers
+Cnt Enb ID Address What
+1 n ust/bar33 0x0000000000400ddc in main at stexample.c:22
+ Data: "str %s"
+[etc...]
+@end smallexample
+
+@noindent
+so you may probe the marker above with:
+
+@smallexample
+(@value{GDBP}) strace -m ust/bar33
+@end smallexample
+
+Static tracepoints accept an extra collect action --- @code{collect
+$_sdata}. This collects arbitrary user data passed in the probe point
+call to the tracing library. In the UST example above, you'll see
+that the third argument to @code{trace_mark} is a printf-like format
+string. The user data is then the result of running that formating
+string against the following arguments. Note that @code{info
+static-tracepoint-markers} command output lists that format string in
+the @samp{Data:} field.
+
+You can inspect this data when analyzing the trace buffer, by printing
+the $_sdata variable like any other variable available to
+@value{GDBN}. @xref{Tracepoint Actions,,Tracepoint Action Lists}.
+
@vindex $tpnum
@cindex last tracepoint number
@cindex recent tracepoint number
@@ -9899,13 +9987,34 @@ special arguments are supported:
@table @code
@item $regs
-collect all registers
+Collect all registers.
@item $args
-collect all function arguments
+Collect all function arguments.
@item $locals
-collect all local variables.
+Collect all local variables.
+
+@item $_sdata
+@vindex $_sdata@r{, collect}
+Collect static tracepoint marker specific data. Only available for
+static tracepoints. @xref{Tracepoint Actions,,Tracepoint Action
+Lists}. On the UST static tracepoints library backend, an
+instrumentation point resembles a @code{printf} function call. The
+tracing library is able to collect user specified data formatted to a
+character string using the format provided by the programmer that
+instrumented the program. Other backends have similar mechanisms.
+Here's an example of a UST marker call:
+
+@smallexample
+ const char master_name[] = "$your_name";
+ trace_mark(channel1, marker1, "hello %s", master_name)
+@end smallexample
+
+In this case, collecting @code{$_sdata} collects the string
+@samp{hello $yourname}. When analyzing the trace buffer, you can
+inspect @samp{$_sdata} like any other variable available to
+@value{GDBN}.
@end table
You can give several consecutive @code{collect} commands, each one
@@ -10000,6 +10109,61 @@ Num Type Disp Enb Address
This command can be abbreviated @code{info tp}.
@end table
+@node Listing Static Tracepoint Markers
+@subsection Listing Static Tracepoint Markers
+
+@table @code
+@kindex info static-tracepoint-markers
+@cindex information about static tracepoint markers
+@item info static-tracepoint-markers
+Display information about all static tracepoint markers defined in the
+program.
+
+For each marker, the following columns are printed:
+
+@table @emph
+@item Count
+An incrementing counter, output to help readability. This is not a
+stable identifier.
+@item ID
+The marker ID, as reported by the target.
+Whether the breakpoint is marked to be disabled or deleted when hit.
+@item Enabled or Disabled
+Probed markers are tagged with @samp{y}. @samp{n} identifies marks
+that are not enabled.
+@item Address
+Where the marker is in your program, as a memory address.
+@item What
+Where the marker is in the source for your program, as a file and line
+number. If the debug information included in the program does not
+allow @value{GDBN} to locate the source of the marker, this column
+will be left blank.
+@end table
+
+@noindent
+In addition, the following information may be printed for each marker:
+
+@table @emph
+@item Data
+User data passed to the tracing library by the marker call. In the
+UST backend, this is the the format string passed as argument to the
+marker call.
+@item Static tracepoints probing the marker
+The list of static tracepoints attached to the marker.
+@end table
+
+@smallexample
+(@value{GDBP}) info static-tracepoint-markers
+Cnt ID Enb Address What
+1 ust/bar2 y 0x0000000000400e1a in main at stexample.c:25
+ Data: number1 %d number2 %d
+ Probed by static tracepoints: #2
+2 ust/bar33 n 0x0000000000400c87 in main at stexample.c:24
+ Data: str %s
+(@value{GDBP})
+@end smallexample
+@end table
+
@node Starting and Stopping Trace Experiments
@subsection Starting and Stopping Trace Experiments
@@ -15848,13 +16012,21 @@ of a multi-process mode debug session.
@subsection Tracepoints support in @code{gdbserver}
@cindex tracepoints support in @code{gdbserver}
-On some targets, @code{gdbserver} supports tracepoints and fast
-tracepoints.
+On some targets, @code{gdbserver} supports tracepoints, fast
+tracepoints and static tracepoints.
-For fast tracepoints to work, a special library called the
+For fast or static tracepoints to work, a special library called the
@dfn{in-process agent} (IPA), must be loaded in the inferior process.
This library is built and distributed as an integral part of
-@code{gdbserver}.
+@code{gdbserver}. In addition, support for static tracepoints
+requires building the in-process agent library with static tracepoints
+support. At present, the UST (LTTng Userspace Tracer,
+@url{http://lttng.org/ust}) tracing engine is supported. This support
+is automatically available if UST development headers are found in the
+standard include path when @code{gdbserver} is built, or if
+@code{gdbserver} was explicitly configured using @option{--with-ust}
+to point at such headers. You can explicitly disable the support
+using @option{--with-ust=no}.
There are several ways to load the in-process agent in your program:
@@ -15895,10 +16067,10 @@ systems, when you connect to @code{gdbse
remote}, you'll find that the program is stopped at the dynamic
loader's entry point, and no shared library has been loaded in the
program's address space yet, including the in-process agent. In that
-case, before being able to use any of the fast tracepoints features,
-you need to let the loader run and load the shared libraries. The
-most simple way to do that is to run the program to the main
-procedure. E.g., if debugging a C or C@t{++} program, start
+case, before being able to use any of the fast or static tracepoints
+features, you need to let the loader run and load the shared
+libraries. The simplest way to do that is to run the program to the
+main procedure. E.g., if debugging a C or C@t{++} program, start
@code{gdbserver} like so:
@smallexample
@@ -15918,7 +16090,8 @@ $ gdb myprogram
The in-process tracing agent library should now be loaded into the
process; you can confirm it with the @code{info sharedlibrary}
command, which will list @file{libinproctrace.so} as loaded in the
-process. You are now ready to install fast tracepoints and start
+process. You are now ready to install fast tracepoints, list static
+tracepoint markers, probe static tracepoints markers, and start
tracing.
@node Remote Configuration
@@ -16170,6 +16343,10 @@ are:
@tab @code{qXfer:memory-map:read}
@tab @code{info mem}
+@item @code{read-sdata-object}
+@tab @code{qXfer:sdata:read}
+@tab @code{print $_sdata}
+
@item @code{read-spu-object}
@tab @code{qXfer:spu:read}
@tab @code{info spu}
@@ -31807,6 +31984,11 @@ These are the currently defined stub fea
@tab @samp{-}
@tab Yes
+@item @samp{qXfer:sdata:read}
+@tab No
+@tab @samp{-}
+@tab Yes
+
@item @samp{qXfer:spu:read}
@tab No
@tab @samp{-}
@@ -31910,6 +32092,10 @@ The remote stub understands the @samp{qX
The remote stub understands the @samp{qXfer:memory-map:read} packet
(@pxref{qXfer memory map read}).
+@item qXfer:sdata:read
+The remote stub understands the @samp{qXfer:sdata:read} packet
+(@pxref{qXfer sdata read}).
+
@item qXfer:spu:read
The remote stub understands the @samp{qXfer:spu:read} packet
(@pxref{qXfer spu read}).
@@ -31978,6 +32164,10 @@ the source form of tracepoint definition
@item QAllow
The remote stub understands the @samp{QAllow} packet.
+@item StaticTracepoint
+@cindex static tracepoints, in remote protocol
+The remote stub supports static tracepoints.
+
@end table
@item qSymbol::
@@ -32062,6 +32252,9 @@ packets.)
@itemx QTro
@itemx qTStatus
@itemx qTV
+@itemx qTfSTM
+@itemx qTsSTM
+@itemx qTSTMat
@xref{Tracepoint Packets}.
@item qXfer:@var{object}:read:@var{annex}:@var{offset},@var{length}
@@ -32118,6 +32311,18 @@ annex part of the generic @samp{qXfer} p
This packet is not probed by default; the remote stub must request it,
by supplying an appropriate @samp{qSupported} response (@pxref{qSupported}).
+@item qXfer:sdata:read::@var{offset},@var{length}
+@anchor{qXfer sdata read}
+
+Read contents of the extra collected static tracepoint marker
+information. The annex part of the generic @samp{qXfer} packet must
+be empty (@pxref{qXfer read}). @xref{Tracepoint Actions,,Tracepoint
+Action Lists}.
+
+This packet is not probed by default; the remote stub must request it,
+by supplying an appropriate @samp{qSupported} response
+(@pxref{qSupported}).
+
@item qXfer:siginfo:read::@var{offset},@var{length}
@anchor{qXfer siginfo read}
Read contents of the extra signal information on the target
@@ -32657,6 +32862,43 @@ and multiple @code{qTsV} to get addition
these packets follow the syntax of the @code{QTDV} packets that define
trace state variables.
+@item qTfSTM
+@itemx qTsSTM
+These packets request data about static tracepoint markers that exist
+in the target program. @value{GDBN} sends @code{qTfSTM} to get the
+first piece of data, and multiple @code{qTsSTM} to get additional
+pieces. Replies to these packets take the following form:
+
+Reply:
+@table @samp
+@item m @var{address}:@var{id}:@var{extra}
+A single marker
+@item m @var{address}:@var{id}:@var{extra},@var{address}:@var{id}:@var{extra}@dots{}
+a comma-separated list of markers
+@item l
+(lower case letter @samp{L}) denotes end of list.
+@item E @var{nn}
+An error occurred. @var{nn} are hex digits.
+@item
+An empty reply indicates that the request is not supported by the
+stub.
+@end table
+
+@var{address} is encoded in hex.
+@var{id} and @var{extra} are strings encoded in hex.
+
+In response to each query, the target will reply with a list of one or
+more markers, separated by commas. @value{GDBN} will respond to each
+reply with a request for more markers (using the @samp{qs} form of the
+query), until the target responds with @samp{l} (lower-case ell, for
+@dfn{last}).
+
+@item qTSTMat:@var{address}
+This packets requests data about static tracepoint markers in the
+target program at @var{address}. Replies to this packet follow the
+syntax of the @samp{qTfSTM} and @code{qTsSTM} packets that list static
+tracepoint markers.
+
@item QTSave:@var{filename}
This packet directs the target to save trace data to the file name
@var{filename} in the target's filesystem. @var{filename} is encoded
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